{"title":"HSS Split Dies – Metric, Imperial, Right \u0026 Left Hand Thread Cutting Dies","description":"\u003ch2 data-pm-slice=\"1 1 []\" style=\"text-align: center;\"\u003e\u003cspan\u003eHSS Adjustable Split Dies for External Thread Cutting\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eExplore our range of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHigh Speed Steel (HSS) Split Dies\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, designed for cutting new external threads and repairing or restoring existing threads on bolts, rods, studs and other threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eOur range includes Metric Coarse, Metric Fine, UNC, UNF, UNEF, UNS, UNJF, BSW, BSF, BSB, BA, Model Engineer Whitworth, BSCY and BSP thread forms, together with specialist left-hand threading dies.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eManufactured from High Speed Steel, these round split dies are suitable for general engineering, precision machining, automotive repairs, machinery maintenance, fabrication and restoration work.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eUnlike solid die nuts, \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eadjustable split dies feature a split in the die body\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, allowing minor adjustments to the thread fit when used with a compatible die stock or die holder.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eWhether you are producing new external threads or restoring damaged threads, our selection of metric and imperial split dies provides solutions for a wide range of engineering applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eAvailable Split Die Thread Types\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 style=\"text-align: center;\"\u003e\u003cspan\u003eMetric Split Dies\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cspan\u003eMetric Coarse (M)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eMetric Coarse split dies are designed for cutting standard ISO metric external threads. They feature a 60° thread profile and are widely used in engineering, manufacturing, automotive repairs and general machinery maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cspan\u003eMetric Fine (MF)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eMetric Fine split dies feature the same 60° ISO metric thread profile but use a finer pitch than Metric Coarse threads of the same diameter. They are commonly used in precision engineering, automotive components and specialist mechanical assemblies.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003e\u003cspan\u003eUnified Thread Split Dies\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cspan\u003eUNC – Unified National Coarse\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eUNC split dies are designed for cutting Unified Coarse external threads with a 60° thread profile. Commonly used in machinery, industrial equipment and general engineering applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cspan\u003eUNF – Unified National Fine\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eUNF split dies are suitable for producing finer-pitch Unified external threads, commonly found in automotive engineering, machinery and precision mechanical components.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cspan\u003eUNEF – Unified National Extra Fine\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eUNEF split dies are designed for extra-fine Unified threads used in specialist engineering applications requiring finer thread pitches.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cspan\u003eUNJF – Unified National J-Series Fine\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eUNJF split dies are designed for the specialist Unified J-Series thread form, which features a controlled external root radius to reduce stress concentrations. Used in aerospace and other high-performance engineering applications where the relevant specifications permit die-cut threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cspan\u003eUNS – Unified National Special\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eUNS split dies are suitable for special Unified thread diameter and pitch combinations outside the standard UNC, UNF and UNEF series.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003e\u003cspan\u003eBritish Standard \u0026amp; Whitworth Split Dies\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cspan\u003eBSW – British Standard Whitworth\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBSW split dies feature a 55° Whitworth thread profile with rounded crests and roots. Commonly used for maintaining older British machinery, vintage vehicles and traditional engineering equipment.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cspan\u003eBSF – British Standard Fine\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBSF split dies use a finer-pitch Whitworth thread form, making them particularly useful for classic vehicle restoration, machinery maintenance and traditional British engineering applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cspan\u003eBSB – British Standard Brass\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBSB split dies are designed for British Standard Brass threads, traditionally featuring a 55° thread profile and 26 threads per inch. Commonly used for brass fittings, instruments and specialist engineering components.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cspan\u003eBA – British Association\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBA split dies feature a distinctive 47.5° thread profile and are available in numbered thread sizes. They are particularly useful for model engineering, electrical equipment, instruments and small precision components.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cspan\u003eME – Model Engineer Whitworth\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eModel Engineer split dies feature a 55° Whitworth thread profile and commonly use fine pitches of 32 or 40 TPI. Suitable for model steam engines, miniature machinery and specialist model engineering applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cspan\u003eBSCY – British Standard Cycle\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBSCY split dies are designed for British Standard Cycle threads, also known as CEI threads. Featuring a 60° thread profile, they are particularly useful for classic bicycle and vintage British motorcycle restoration.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003e\u003cspan\u003eBSP Pipe Thread Split Dies\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cspan\u003eBSP – British Standard Pipe Parallel\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBSP split dies are designed for cutting parallel external pipe threads with a 55° Whitworth profile. Commonly used for hydraulic fittings, pneumatic connections, pipe fittings and industrial machinery.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003e\u003cspan\u003eLeft Hand Split Dies\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eOur range also includes specialist \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eLeft Hand Split Dies\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, designed for producing external threads that tighten anticlockwise rather than clockwise.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eAvailable thread forms include:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eUNC Left Hand – Unified National Coarse\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eUNF Left Hand – Unified National Fine\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBSW Left Hand – British Standard Whitworth\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBSF Left Hand – British Standard Fine\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBA Left Hand – British Association\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBSP Left Hand – British Standard Pipe Parallel\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eLeft-hand threads are commonly specified for rotating assemblies, specialist fasteners, machinery components and applications requiring reverse-threaded connections.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eWhy Choose HSS Split Dies?\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHigh Speed Steel Construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for thread cutting across a range of machinable engineering materials.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAdjustable Split Design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Allows minor adjustment of the thread fit using a compatible die holder.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eNew Thread Cutting\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for producing external threads on appropriately prepared workpieces.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThread Repair \u0026amp; Restoration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Useful for cleaning and restoring damaged or worn external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eMetric \u0026amp; Imperial Options\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – A wide selection of thread forms and pitches.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRight Hand \u0026amp; Left Hand Threads\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Options for standard and reverse-threaded applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eWorkshop Versatility\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for engineering, maintenance, fabrication and restoration.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eMultiple Thread Sizes\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Choose the appropriate diameter and pitch for your application.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eSplit Dies vs Die Nuts – What's the Difference?\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cspan\u003eSplit Dies\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eRound adjustable split dies are primarily designed for cutting new external threads. Their split construction allows minor adjustment of the thread fit, making them suitable for thread production as well as restoration.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cspan\u003eDie Nuts\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eHexagon die nuts are generally used for cleaning, chasing and restoring existing external threads. They are typically fixed in size and are not intended as the primary tool for cutting full-depth new threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eFor producing new external threads, an appropriately specified HSS split die is generally the preferred option.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eChoosing the Correct Split Die\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eWhen selecting a split die, it is important to identify the correct:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThread Type\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Metric, UNC, UNF, BSW, BSF, BA, BSP or another thread series.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThread Diameter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – The nominal outside diameter of the thread.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThread Pitch\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Specified in millimetres for metric threads or threads per inch (TPI) for imperial threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThread Direction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Right hand or left hand.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eDie Outside Diameter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – The physical outside diameter of the die, which must fit the selected die stock or holder.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eDifferent thread forms are not necessarily interchangeable, even when their nominal diameters or thread pitches appear similar.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eFor best results, use the correct die holder, prepare the workpiece to the appropriate diameter, apply suitable cutting lubricant and check the finished thread using an appropriate thread gauge.\u003c\/span\u003e\u003c\/p\u003e","products":[{"product_id":"hss-split-dies-metric-course","title":"HSS Split Dies Metric Coarse","description":"\u003cdiv style=\"text-align: center;\"\u003eManufactured To DIN223 Standard\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003eMade out of HSS M2 Material\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2 style=\"text-align: center;\"\u003eHSS Split Dies Metric Coarse - 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They can be used for producing new external threads as well as cleaning up and restoring existing damaged or worn threads.\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003eDesigned for use on components such as bolts, studs, threaded bar, shafts and other suitable workpieces requiring an accurately formed external thread.\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003eThese are right hand thread split dies and are available in a wide range of thread sizes and forms. Simply select the required thread size from the options provided.\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003eKey Features\u003c\/p\u003e\n\u003cul style=\"text-align: center;\"\u003e\n\u003cli\u003eProfessional quality Wiseman Threading Tools\u003c\/li\u003e\n\u003cli\u003eManufactured from High Speed Steel (HSS)\u003c\/li\u003e\n\u003cli\u003eRight hand thread\u003c\/li\u003e\n\u003cli\u003eSplit die design allows a degree of adjustment\u003c\/li\u003e\n\u003cli\u003eDesigned for cutting external threads\u003c\/li\u003e\n\u003cli\u003eSuitable for producing new threads\u003c\/li\u003e\n\u003cli\u003eCan also be used for cleaning and restoring existing external threads\u003c\/li\u003e\n\u003cli\u003eSuitable for bolts, studs, threaded bar, shafts and other components\u003c\/li\u003e\n\u003cli\u003eDesigned for use with a suitable die stock\u003c\/li\u003e\n\u003cli\u003eWide range of thread sizes available\u003c\/li\u003e\n\u003cli\u003eSuitable for engineering, machining, automotive, maintenance and workshop applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"text-align: center;\"\u003ePlease select the required thread size from the options provided.\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003eAlso commonly known as a split die, adjustable die, round split die, threading die, HSS die, external threading die, screw cutting die or thread cutting die.\u003c\/p\u003e","brand":"Rennie Tool Company","offers":[{"title":"M1.6 x 0.35 (13\/16\" OD)","offer_id":57440787759479,"sku":"D10051","price":33.25,"currency_code":"GBP","in_stock":true},{"title":"M2 x 0.4 (13\/16\" OD)","offer_id":57440787792247,"sku":"D10101","price":23.67,"currency_code":"GBP","in_stock":true},{"title":"M2.5 x 0.45 (13\/16\" OD)","offer_id":57440789791095,"sku":"D10301","price":23.67,"currency_code":"GBP","in_stock":true},{"title":"M3 x 0.5 (13\/16\" 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cutting, repairing and restoring external left hand threads.\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003eManufactured from High Speed Steel (HSS), these split dies are suitable for engineering, machining, maintenance, automotive, fabrication and general workshop applications.\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003eThe split design allows a small degree of adjustment when used in a suitable die stock, allowing the cutting fit to be controlled during threading operations. They can be used for producing new external threads as well as cleaning up and restoring existing damaged or worn threads.\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003eDesigned for use on components such as bolts, studs, threaded bar, shafts and other suitable workpieces requiring an accurately formed external left hand thread.\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003eThese are left hand thread split dies, sometimes referred to as reverse thread dies, and are available in a wide range of thread sizes and forms. Simply select the required thread size from the options provided.\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003eKey Features\u003c\/p\u003e\n\u003cul style=\"text-align: center;\"\u003e\n\u003cli\u003eProfessional quality Wiseman Threading Tools\u003c\/li\u003e\n\u003cli\u003eManufactured from High Speed Steel (HSS)\u003c\/li\u003e\n\u003cli\u003eLeft hand thread\u003c\/li\u003e\n\u003cli\u003eSuitable for cutting left hand or reverse external threads\u003c\/li\u003e\n\u003cli\u003eSplit die design allows a degree of adjustment\u003c\/li\u003e\n\u003cli\u003eDesigned for cutting new external threads\u003c\/li\u003e\n\u003cli\u003eCan also be used for cleaning and restoring existing threads\u003c\/li\u003e\n\u003cli\u003eSuitable for bolts, studs, threaded bar, shafts and other components\u003c\/li\u003e\n\u003cli\u003eDesigned for use with a suitable die stock\u003c\/li\u003e\n\u003cli\u003eWide range of thread sizes available\u003c\/li\u003e\n\u003cli\u003eSuitable for engineering, machining, automotive, maintenance and workshop applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"text-align: center;\"\u003ePlease select the required thread size from the options provided.\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003eAlso commonly known as a left hand split die, LH split die, reverse thread die, adjustable die, round split die, threading die, HSS die, external threading die, screw cutting die or thread cutting die.\u003c\/p\u003e","brand":"Rennie Tool Company","offers":[{"title":"M2 x 0.4 (13\/16\" OD)","offer_id":57440794247543,"sku":"D10101L","price":42.57,"currency_code":"GBP","in_stock":true},{"title":"M2.5 x 0.45 (13\/16\" OD)","offer_id":57440794280311,"sku":"D10301L","price":42.14,"currency_code":"GBP","in_stock":true},{"title":"M3 x 0.5 (13\/16\" OD)","offer_id":57440796049783,"sku":"D10451L","price":37.46,"currency_code":"GBP","in_stock":true},{"title":"M4 x 0.7 (13\/16\" 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Right Hand Thread","description":"\u003cp data-pm-slice=\"1 3 []\" style=\"text-align: center;\"\u003e\u003cspan\u003eWiseman HSS UNC Split Dies are manufactured from High Speed Steel (HSS) and designed for cutting new external UNC (Unified National Coarse) threads, as well as repairing, cleaning and restoring damaged or worn existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese precision-engineered round split dies feature an adjustable split design, allowing minor adjustments to the thread fit when used with a suitable die stock. This makes them particularly useful for general engineering, thread cutting, maintenance and workshop applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eUNC threads feature a 60° thread profile and a coarser pitch than UNF (Unified National Fine) threads of the same nominal diameter. Unified National Coarse threads are widely used in engineering, machinery, automotive applications and industrial equipment, particularly where a robust thread form is required.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eManufactured with a right-hand thread profile, these split dies are suitable for producing and restoring UNC threads on bolts, studs, rods and other externally threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHigh Speed Steel (HSS)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Durable construction for reliable thread cutting and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eUNC Thread Form\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for Unified National Coarse external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRight Hand Thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Standard clockwise tightening thread direction.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAdjustable Split Design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Allows minor adjustment of the thread fit when used with a suitable die stock.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRound Die Construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for use with compatible die stocks and die holders.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThread Cutting \u0026amp; Restoration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for cutting new external threads and repairing existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e60° Thread Profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Unified thread form featuring a coarse thread pitch.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eVersatile Applications\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for general engineering, fabrication and maintenance work.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eProfessional Quality\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Manufactured by Wiseman Threading Tools for engineering and workshop applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSuitable for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCutting new UNC external threads on rods, bolts and studs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRepairing damaged or worn UNC threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCleaning and restoring existing external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eGeneral engineering and workshop machining.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAutomotive and machinery repairs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eFabrication and maintenance of threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufacturing replacement bolts and studs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eApplications requiring Unified National Coarse threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eRecommended Use\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSelect the correct UNC split die size and pitch to match the required external thread.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSecure the die in a suitable die stock or holder, ensuring the adjustment screws are correctly positioned. Prepare the workpiece to the appropriate diameter and apply a suitable chamfer to help the die start squarely.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eApply an appropriate cutting lubricant and rotate the die clockwise to cut the thread. Periodically reverse the die slightly to help break and clear chips where appropriate for the material and cutting conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThe adjustable split design allows minor adjustments to the thread fit. For accurate results, check the finished thread using a suitable thread gauge or mating component.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eImportant\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eSuitable for UNC (Unified National Coarse) right-hand external threads only.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eNot compatible with UNF, UNEF, metric or other thread forms.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eAdjustable round split die for cutting and restoring external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eRequires a compatible die stock or die holder.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eEnsure the correct thread diameter and threads per inch (TPI) are selected before use.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Rennie Tool Company","offers":[{"title":"8-32 UNC (13\/16\" OD)","offer_id":57740553716087,"sku":"D20351","price":20.62,"currency_code":"GBP","in_stock":true},{"title":"10-24 UNC (13\/16\" OD)","offer_id":57740553748855,"sku":"D20401","price":20.62,"currency_code":"GBP","in_stock":true},{"title":"12-24 UNC (13\/16\" OD)","offer_id":57740553781623,"sku":"D20451","price":20.62,"currency_code":"GBP","in_stock":true},{"title":"1\/4\" x 20 UNC (13\/16\" OD)","offer_id":57740553814391,"sku":"D20501","price":16.15,"currency_code":"GBP","in_stock":true},{"title":"1\/4\" x 20 UNC (1\" OD)","offer_id":57740553847159,"sku":"D20502","price":19.73,"currency_code":"GBP","in_stock":true},{"title":"5\/16\" x 18 UNC (1\" OD)","offer_id":57740553879927,"sku":"D20552","price":19.73,"currency_code":"GBP","in_stock":true},{"title":"3\/8\" x 16 UNC (1\" OD)","offer_id":57740553912695,"sku":"D20602","price":19.73,"currency_code":"GBP","in_stock":true},{"title":"7\/16\" x 14 UNC (1.5\/16\" OD)","offer_id":57740553945463,"sku":"D20653","price":28.32,"currency_code":"GBP","in_stock":true},{"title":"1\/2\" x 13 UNC (1.5\/16\" OD)","offer_id":57740553978231,"sku":"D20703","price":28.32,"currency_code":"GBP","in_stock":true},{"title":"9\/16\" x 12 UNC (1.5\/16\" OD)","offer_id":57740554010999,"sku":"D20753","price":28.32,"currency_code":"GBP","in_stock":true},{"title":"5\/8\" x 11 UNC (1.1\/2\" OD)","offer_id":57740554043767,"sku":"D20804","price":33.26,"currency_code":"GBP","in_stock":true},{"title":"5\/8\" x 11 UNC (2\" OD)","offer_id":57740554076535,"sku":"D20805","price":62.2,"currency_code":"GBP","in_stock":true},{"title":"3\/4\" x 10 UNC (1.1\/2\" OD)","offer_id":57740554109303,"sku":"D20854","price":33.26,"currency_code":"GBP","in_stock":true},{"title":"7\/8\" x 9 UNC (2\" OD)","offer_id":57740554142071,"sku":"D20905","price":62.2,"currency_code":"GBP","in_stock":true},{"title":"1\" x 8 UNC (2\" OD)","offer_id":57740554174839,"sku":"D20955","price":62.2,"currency_code":"GBP","in_stock":true},{"title":"1.1\/8\" x 7 UNC (3\" OD)","offer_id":57740554207607,"sku":"D21007","price":139.07,"currency_code":"GBP","in_stock":true},{"title":"1.1\/4\" x 7 UNC (3\" OD)","offer_id":57740554240375,"sku":"D21057","price":139.07,"currency_code":"GBP","in_stock":true},{"title":"1.3\/8\" x 6 UNC (3\" OD)","offer_id":57740554273143,"sku":"D21107","price":139.07,"currency_code":"GBP","in_stock":true},{"title":"1.1\/2\" x 6 UNC (3\" OD)","offer_id":57740554305911,"sku":"D21157","price":139.07,"currency_code":"GBP","in_stock":true},{"title":"1.3\/4\" x 5 UNC (3\" OD)","offer_id":57740554338679,"sku":"D21207","price":154.11,"currency_code":"GBP","in_stock":true},{"title":"2\" x 4.5 UNC (4\" OD)","offer_id":57740554371447,"sku":"D21258","price":242.45,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0067\/9129\/9145\/files\/WisemanSplitDie_1e3d6cb7-6db1-4e70-a26f-cc79305d4ad6.png?v=1788643504"},{"product_id":"wiseman-hss-unf-split-dies-unified-fine-right-hand-thread","title":"Wiseman HSS UNF Split Dies – Unified Fine Right Hand Thread","description":"\u003cp data-pm-slice=\"1 3 []\" style=\"text-align: center;\"\u003e\u003cspan\u003eWiseman HSS UNF Split Dies are manufactured from High Speed Steel (HSS) and designed for cutting new external UNF (Unified National Fine) threads, as well as repairing, cleaning and restoring damaged or worn existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese precision-engineered round split dies feature an adjustable split design, allowing minor adjustments to the thread fit when used with a suitable die stock. This makes them particularly useful for general engineering, thread cutting, maintenance and workshop applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eUNF threads feature a 60° thread profile and a finer pitch than UNC (Unified National Coarse) threads of the same nominal diameter. Unified National Fine threads are widely used in precision engineering, automotive applications, machinery and industrial equipment, particularly where finer thread adjustment or shorter thread engagement lengths are required.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eManufactured with a right-hand thread profile, these split dies are suitable for producing and restoring UNF threads on bolts, studs, rods and other externally threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHigh Speed Steel (HSS)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Durable construction for reliable thread cutting and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eUNF Thread Form\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for Unified National Fine external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRight Hand Thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Standard clockwise tightening thread direction.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAdjustable Split Design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Allows minor adjustment of the thread fit when used with a suitable die stock.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRound Die Construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for use with compatible die stocks and die holders.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThread Cutting \u0026amp; Restoration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for cutting new external threads and repairing existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e60° Thread Profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Unified thread form featuring a fine thread pitch.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eVersatile Applications\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for general engineering, automotive and maintenance work.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eProfessional Quality\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Manufactured by Wiseman Threading Tools for engineering and workshop applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSuitable for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCutting new UNF external threads on rods, bolts and studs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRepairing damaged or worn UNF threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCleaning and restoring existing external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eGeneral engineering and workshop machining.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAutomotive and machinery repairs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eFabrication and maintenance of threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufacturing replacement bolts and studs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eApplications requiring Unified National Fine threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eRecommended Use\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSelect the correct UNF split die size and pitch to match the required external thread.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSecure the die in a suitable die stock or holder, ensuring the adjustment screws are correctly positioned. Prepare the workpiece to the appropriate diameter and apply a suitable chamfer to help the die start squarely.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eApply an appropriate cutting lubricant and rotate the die clockwise to cut the thread. Periodically reverse the die slightly to help break and clear chips where appropriate for the material and cutting conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThe adjustable split design allows minor adjustments to the thread fit. For accurate results, check the finished thread using a suitable thread gauge or mating component.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eImportant\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eSuitable for UNF (Unified National Fine) right-hand external threads only.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eNot compatible with UNC, UNEF, metric or other thread forms.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eAdjustable round split die for cutting and restoring external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eRequires a compatible die stock or die holder.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eEnsure the correct thread diameter and threads per inch (TPI) are selected before use.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Rennie Tool Company","offers":[{"title":"0-80 UNF (13\/16\" OD)","offer_id":57740554436983,"sku":"D22001","price":38.49,"currency_code":"GBP","in_stock":true},{"title":"2-64 UNF (13\/16\" OD)","offer_id":57740554469751,"sku":"D22101","price":28.95,"currency_code":"GBP","in_stock":true},{"title":"3-56 UNF (13\/16\" OD)","offer_id":57740554502519,"sku":"D22151","price":28.95,"currency_code":"GBP","in_stock":true},{"title":"4-48 UNF (13\/16\" OD)","offer_id":57740554535287,"sku":"D22201","price":23.23,"currency_code":"GBP","in_stock":true},{"title":"5-44 UNF (13\/16\" OD)","offer_id":57740554568055,"sku":"D22251","price":23.23,"currency_code":"GBP","in_stock":true},{"title":"6-40 UNF (13\/16\" OD)","offer_id":57740554600823,"sku":"D22301","price":23.23,"currency_code":"GBP","in_stock":true},{"title":"8-36 UNF (13\/16\" OD)","offer_id":57740554633591,"sku":"D22351","price":23.23,"currency_code":"GBP","in_stock":true},{"title":"10-32 UNF (13\/16\" OD)","offer_id":57740554666359,"sku":"D22401","price":23.23,"currency_code":"GBP","in_stock":true},{"title":"12-28 UNF (13\/16\" OD)","offer_id":57740554699127,"sku":"D22451","price":23.23,"currency_code":"GBP","in_stock":true},{"title":"1\/4\" x 28 UNF (13\/16\" OD)","offer_id":57740554731895,"sku":"D22501","price":18.41,"currency_code":"GBP","in_stock":true},{"title":"1\/4\" x 28 UNF (1\" OD)","offer_id":57740554764663,"sku":"D22502","price":21.81,"currency_code":"GBP","in_stock":true},{"title":"5\/16\" x 24 UNF (1\" OD)","offer_id":57740554797431,"sku":"D22552","price":21.81,"currency_code":"GBP","in_stock":true},{"title":"3\/8\" x 24 UNF (1\" OD)","offer_id":57740554830199,"sku":"D22602","price":21.81,"currency_code":"GBP","in_stock":true},{"title":"7\/16\" x 20 UNF (1\" OD)","offer_id":57740554862967,"sku":"D22652","price":21.81,"currency_code":"GBP","in_stock":true},{"title":"7\/16\" x 20 UNF (1.5\/16\" OD)","offer_id":57740554895735,"sku":"D22653","price":31.89,"currency_code":"GBP","in_stock":true},{"title":"1\/2\" x 20 UNF (1.5\/16\" OD)","offer_id":57740554928503,"sku":"D22703","price":31.89,"currency_code":"GBP","in_stock":true},{"title":"9\/16\" x 18 UNF (1.5\/16\" OD)","offer_id":57740554961271,"sku":"D22753","price":31.89,"currency_code":"GBP","in_stock":true},{"title":"5\/8\" x 18 UNF (1.1\/2\" OD)","offer_id":57740554994039,"sku":"D22804","price":36.15,"currency_code":"GBP","in_stock":true},{"title":"3\/4\" x 16 UNF (1.1\/2\" OD)","offer_id":57740555026807,"sku":"D22854","price":36.15,"currency_code":"GBP","in_stock":true},{"title":"7\/8\" x 14 UNF (2\" OD)","offer_id":57740555059575,"sku":"D22905","price":70.87,"currency_code":"GBP","in_stock":true},{"title":"1\" x 12 UNF (2\" OD)","offer_id":57740555092343,"sku":"D22955","price":70.87,"currency_code":"GBP","in_stock":true},{"title":"1.1\/8\" x 12 UNF (3\" OD)","offer_id":57740555125111,"sku":"D23007","price":164.87,"currency_code":"GBP","in_stock":true},{"title":"1.1\/4\" x 12 UNF (3\" OD)","offer_id":57740555157879,"sku":"D23057","price":164.87,"currency_code":"GBP","in_stock":true},{"title":"1.3\/8\" x 12 UNF (3\" OD)","offer_id":57740555190647,"sku":"D23107","price":164.87,"currency_code":"GBP","in_stock":true},{"title":"1.1\/2\" x 12 UNF (3\" OD)","offer_id":57740555223415,"sku":"D23157","price":164.87,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0067\/9129\/9145\/files\/WisemanSplitDie_1e3d6cb7-6db1-4e70-a26f-cc79305d4ad6.png?v=1788643504"},{"product_id":"wiseman-hss-unef-split-dies-unified-extra-fine-right-hand-thread","title":"Wiseman HSS UNEF Split Dies – Unified Extra Fine Right Hand Thread","description":"\u003cp data-pm-slice=\"1 3 []\" style=\"text-align: center;\"\u003e\u003cspan\u003eWiseman HSS UNEF Split Dies are manufactured from High Speed Steel (HSS) and designed for cutting new external UNEF (Unified National Extra Fine) threads, as well as repairing, cleaning and restoring damaged or worn existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese precision-engineered round split dies feature an adjustable split design, allowing minor adjustments to the thread fit when used with a suitable die stock. This makes them particularly useful for precision engineering, thread cutting, maintenance and specialist workshop applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eUNEF threads feature a 60° thread profile and a finer pitch than UNC (Unified National Coarse) and UNF (Unified National Fine) threads of the same nominal diameter. Unified National Extra Fine threads are commonly specified in precision engineering, automotive, aerospace and specialist machinery applications where fine thread adjustment or limited thread engagement depth is required.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eManufactured with a right-hand thread profile, these split dies are suitable for producing and restoring UNEF threads on bolts, studs, rods and other externally threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHigh Speed Steel (HSS)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Durable construction for reliable thread cutting and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eUNEF Thread Form\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for Unified National Extra Fine external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRight Hand Thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Standard clockwise tightening thread direction.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAdjustable Split Design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Allows minor adjustment of the thread fit when used with a suitable die stock.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRound Die Construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for use with compatible die stocks and die holders.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThread Cutting \u0026amp; Restoration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for cutting new external threads and repairing existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e60° Thread Profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Unified thread form featuring an extra-fine thread pitch.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePrecision Thread Cutting\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for applications requiring fine-pitch external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eProfessional Quality\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Manufactured by Wiseman Threading Tools for engineering and workshop applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSuitable for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCutting new UNEF external threads on rods, bolts and studs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRepairing damaged or worn UNEF threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCleaning and restoring existing external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePrecision engineering and workshop machining.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAutomotive and specialist machinery repairs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAerospace maintenance where approved tooling and procedures permit.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eFabrication and maintenance of fine-pitch threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufacturing replacement bolts and studs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eApplications requiring Unified National Extra Fine threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eRecommended Use\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSelect the correct UNEF split die size and pitch to match the required external thread.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSecure the die in a suitable die stock or holder, ensuring the adjustment screws are correctly positioned. Prepare the workpiece to the appropriate diameter and apply a suitable chamfer to help the die start squarely.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eApply an appropriate cutting lubricant and rotate the die clockwise to cut the thread. Periodically reverse the die slightly to help break and clear chips where appropriate for the material and cutting conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThe adjustable split design allows minor adjustments to the thread fit. For accurate results, check the finished thread using a suitable thread gauge or mating component.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eImportant\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eSuitable for UNEF (Unified National Extra Fine) right-hand external threads only.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eNot compatible with UNC, UNF, metric or other thread forms.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eAdjustable round split die for cutting and restoring external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eRequires a compatible die stock or die holder.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eEnsure the correct thread diameter and threads per inch (TPI) are selected before use.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Rennie Tool Company","offers":[{"title":"1\/4\" x 32 UNEF (13\/16\" OD)","offer_id":57740555387255,"sku":"D23201","price":39.34,"currency_code":"GBP","in_stock":true},{"title":"5\/16\" x 32 UNEF (1\" OD)","offer_id":57740555420023,"sku":"D23212","price":42.72,"currency_code":"GBP","in_stock":true},{"title":"3\/8\" x 32 UNEF (1\" OD)","offer_id":57740555452791,"sku":"D23222","price":54.39,"currency_code":"GBP","in_stock":true},{"title":"7\/16\" x 28 UNEF (1\" OD)","offer_id":57740555485559,"sku":"D23232","price":54.39,"currency_code":"GBP","in_stock":true},{"title":"1\/2\" x 28 UNEF (1.5\/16\" OD)","offer_id":57740555518327,"sku":"D23243","price":63.98,"currency_code":"GBP","in_stock":true},{"title":"9\/16\" x 24 UNEF (1.5\/16\" OD)","offer_id":57740555551095,"sku":"D23253","price":63.98,"currency_code":"GBP","in_stock":true},{"title":"5\/8\" x 24 UNEF (1.1\/2\" OD)","offer_id":57740555583863,"sku":"D23264","price":92.02,"currency_code":"GBP","in_stock":true},{"title":"11\/16\" x 24 UNEF (1.1\/2\" OD)","offer_id":57740555616631,"sku":"D23274","price":92.02,"currency_code":"GBP","in_stock":true},{"title":"3\/4\" x 20 UNEF (1.1\/2\" OD)","offer_id":57740555649399,"sku":"D23284","price":92.02,"currency_code":"GBP","in_stock":true},{"title":"13\/16\" x 20 UNEF (1.1\/2\" OD)","offer_id":57740555682167,"sku":"D23294","price":92.02,"currency_code":"GBP","in_stock":true},{"title":"7\/8\" x 20 UNEF (2\" OD)","offer_id":57740555714935,"sku":"D23305","price":114.4,"currency_code":"GBP","in_stock":true},{"title":"15\/16\" x 20 UNEF (2\" OD)","offer_id":57740555747703,"sku":"D23315","price":114.4,"currency_code":"GBP","in_stock":true},{"title":"1\" x 20 UNEF (2\" OD)","offer_id":57740555780471,"sku":"D23325","price":114.4,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0067\/9129\/9145\/files\/WisemanSplitDie_1e3d6cb7-6db1-4e70-a26f-cc79305d4ad6.png?v=1788643504"},{"product_id":"wiseman-hss-uns-split-dies-unified-special-right-hand-thread","title":"Wiseman HSS UNS Split Dies – Unified Special Right Hand Thread","description":"\u003cp data-pm-slice=\"1 3 []\" style=\"text-align: center;\"\u003e\u003cspan\u003eWiseman HSS UNS Split Dies are manufactured from High Speed Steel (HSS) and designed for cutting new external UNS (Unified National Special) threads, as well as repairing, cleaning and restoring damaged or worn existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese precision-engineered round split dies feature an adjustable split design, allowing minor adjustments to the thread fit when used with a suitable die stock. This makes them particularly useful for specialist engineering, thread cutting, maintenance and workshop applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eUNS threads feature a 60° Unified thread profile and use special combinations of nominal diameter and thread pitch that fall outside the standard UNC, UNF and UNEF series. Unified National Special threads are commonly specified for specialist machinery, precision components and engineering applications requiring non-standard Unified thread sizes.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eManufactured with a right-hand thread profile, these split dies are suitable for producing and restoring UNS threads on bolts, studs, rods and other externally threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHigh Speed Steel (HSS)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Durable construction for reliable thread cutting and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eUNS Thread Form\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for Unified National Special external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRight Hand Thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Standard clockwise tightening thread direction.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAdjustable Split Design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Allows minor adjustment of the thread fit when used with a suitable die stock.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRound Die Construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for use with compatible die stocks and die holders.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThread Cutting \u0026amp; Restoration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for cutting new external threads and repairing existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e60° Thread Profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Unified thread form featuring special diameter and pitch combinations.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSpecial Thread Sizes\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for applications requiring non-standard Unified thread dimensions.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eProfessional Quality\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Manufactured by Wiseman Threading Tools for specialist engineering and workshop applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSuitable for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCutting new UNS external threads on rods, bolts and studs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRepairing damaged or worn UNS threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCleaning and restoring existing external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePrecision engineering and specialist workshop machining.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAutomotive and machinery repairs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eFabrication and maintenance of specialist threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufacturing replacement bolts and studs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eApplications requiring Unified National Special thread sizes.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eRecommended Use\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSelect the correct UNS split die size and pitch to match the required external thread.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSecure the die in a suitable die stock or holder, ensuring the adjustment screws are correctly positioned. Prepare the workpiece to the appropriate diameter and apply a suitable chamfer to help the die start squarely.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eApply an appropriate cutting lubricant and rotate the die clockwise to cut the thread. Periodically reverse the die slightly to help break and clear chips where appropriate for the material and cutting conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThe adjustable split design allows minor adjustments to the thread fit. For accurate results, check the finished thread using a suitable thread gauge or mating component.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eImportant\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eSuitable for UNS (Unified National Special) right-hand external threads only.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eNot interchangeable with UNC, UNF, UNEF, UNJF or metric thread forms unless the exact thread specifications match.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eAdjustable round split die for cutting and restoring external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eRequires a compatible die stock or die holder.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eEnsure the correct thread diameter and threads per inch (TPI) are selected before use.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Rennie Tool Company","offers":[{"title":"1.1\/8\" x 8 UNS (3\" OD)","offer_id":57740555813239,"sku":"D24007","price":213.94,"currency_code":"GBP","in_stock":true},{"title":"1.1\/4\" x 8 UNS (3\" OD)","offer_id":57740555846007,"sku":"D24057","price":213.94,"currency_code":"GBP","in_stock":true},{"title":"1.3\/8\" x 8 UNS (3\" OD)","offer_id":57740555878775,"sku":"D24107","price":213.94,"currency_code":"GBP","in_stock":true},{"title":"1.1\/2\" x 8 UNS (3\" OD)","offer_id":57740555911543,"sku":"D24157","price":213.94,"currency_code":"GBP","in_stock":true},{"title":"1.5\/8\" x 8 UNS (4\" OD)","offer_id":57740555944311,"sku":"D24208","price":315.58,"currency_code":"GBP","in_stock":true},{"title":"1.3\/4\" x 8 UNS (4\" OD)","offer_id":57740555977079,"sku":"D24258","price":315.58,"currency_code":"GBP","in_stock":true},{"title":"1.7\/8\" x 8 UNS (4\" OD)","offer_id":57740556009847,"sku":"D24308","price":315.58,"currency_code":"GBP","in_stock":true},{"title":"2\" x 8 UNS (4\" OD)","offer_id":57740556042615,"sku":"D24358","price":315.58,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0067\/9129\/9145\/files\/WisemanSplitDie_1e3d6cb7-6db1-4e70-a26f-cc79305d4ad6.png?v=1788643504"},{"product_id":"wiseman-hss-bsw-split-dies-british-standard-whitworth-right-hand-thread","title":"Wiseman HSS BSW Split Dies – British Standard Whitworth Right Hand Thread","description":"\u003cp data-pm-slice=\"1 3 []\" style=\"text-align: center;\"\u003e\u003cspan\u003eWiseman HSS BSW Split Dies are manufactured from High Speed Steel (HSS) and designed for cutting new external BSW (British Standard Whitworth) threads, as well as repairing, cleaning and restoring damaged or worn existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese precision-engineered round split dies feature an adjustable split design, allowing minor adjustments to the thread fit when used with a suitable die stock. This makes them particularly useful for general engineering, thread cutting, maintenance and workshop applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBSW threads feature a 55° Whitworth thread profile with rounded crests and roots. British Standard Whitworth threads are commonly found on older British machinery, vintage vehicles, agricultural equipment and traditional engineering components.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eManufactured with a right-hand thread profile, these split dies are suitable for producing and restoring BSW threads on bolts, studs, rods and other externally threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHigh Speed Steel (HSS)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Durable construction for reliable thread cutting and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBSW Thread Form\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for British Standard Whitworth external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRight Hand Thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Standard clockwise tightening thread direction.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAdjustable Split Design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Allows minor adjustment of the thread fit when used with a suitable die stock.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRound Die Construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for use with compatible die stocks and die holders.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThread Cutting \u0026amp; Restoration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for cutting new external threads and repairing existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e55° Thread Profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Whitworth thread form featuring rounded crests and roots.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eVersatile Applications\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for general engineering, restoration and maintenance work.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eProfessional Quality\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Manufactured by Wiseman Threading Tools for engineering and workshop applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSuitable for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCutting new BSW external threads on rods, bolts and studs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRepairing damaged or worn BSW threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCleaning and restoring existing external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eGeneral engineering and workshop machining.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eVintage and classic vehicle restoration.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eMaintenance of older British machinery and equipment.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAgricultural machinery repairs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufacturing replacement bolts and studs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eApplications requiring British Standard Whitworth threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eRecommended Use\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSelect the correct BSW split die size and pitch to match the required external thread.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSecure the die in a suitable die stock or holder, ensuring the adjustment screws are correctly positioned. Prepare the workpiece to the appropriate diameter and apply a suitable chamfer to help the die start squarely.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eApply an appropriate cutting lubricant and rotate the die clockwise to cut the thread. Periodically reverse the die slightly to help break and clear chips where appropriate for the material and cutting conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThe adjustable split design allows minor adjustments to the thread fit. For accurate results, check the finished thread using a suitable thread gauge or mating component.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eImportant\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eSuitable for BSW (British Standard Whitworth) right-hand external threads only.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eNot compatible with BSF, UNC, UNF, metric or other thread forms unless the exact thread specifications match.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eAdjustable round split die for cutting and restoring external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eRequires a compatible die stock or die holder.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eEnsure the correct thread diameter and threads per inch (TPI) are selected before use.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Rennie Tool Company","offers":[{"title":"1\/8\" x 40 BSW (13\/16\" OD)","offer_id":57740556304759,"sku":"D30101","price":22.07,"currency_code":"GBP","in_stock":true},{"title":"5\/32\" x 32 BSW (13\/16\" OD)","offer_id":57740556337527,"sku":"D30151","price":26.87,"currency_code":"GBP","in_stock":true},{"title":"3\/16\" x 24 BSW (13\/16\" OD)","offer_id":57740556370295,"sku":"D30201","price":22.07,"currency_code":"GBP","in_stock":true},{"title":"7\/32\" x 24 BSW (13\/16\" OD)","offer_id":57740556403063,"sku":"D30251","price":26.87,"currency_code":"GBP","in_stock":true},{"title":"1\/4\" x 20 BSW (13\/16\" OD)","offer_id":57740556435831,"sku":"D30301","price":18.11,"currency_code":"GBP","in_stock":true},{"title":"1\/4\" x 20 BSW (1\" OD)","offer_id":57740556468599,"sku":"D30302","price":20.86,"currency_code":"GBP","in_stock":true},{"title":"5\/16\" x 18 BSW (1\" OD)","offer_id":57740556501367,"sku":"D30402","price":20.86,"currency_code":"GBP","in_stock":true},{"title":"3\/8\" x 16 BSW (1\" OD)","offer_id":57740556534135,"sku":"D30452","price":20.86,"currency_code":"GBP","in_stock":true},{"title":"7\/16\" x 14 BSW (1.5\/16\" OD)","offer_id":57740556566903,"sku":"D30503","price":31.41,"currency_code":"GBP","in_stock":true},{"title":"1\/2\" x 12 BSW (1.5\/16\" OD)","offer_id":57740556599671,"sku":"D30553","price":31.41,"currency_code":"GBP","in_stock":true},{"title":"9\/16\" x 12 BSW (1.5\/16\" OD)","offer_id":57740556632439,"sku":"D30603","price":31.41,"currency_code":"GBP","in_stock":true},{"title":"5\/8\" x 11 BSW (1.1\/2\" OD)","offer_id":57740556665207,"sku":"D30654","price":36.7,"currency_code":"GBP","in_stock":true},{"title":"3\/4\" x 10 BSW (1.1\/2\" OD)","offer_id":57740556697975,"sku":"D30754","price":36.7,"currency_code":"GBP","in_stock":true},{"title":"7\/8\" x 9 BSW (2\" OD)","offer_id":57740556730743,"sku":"D30855","price":62.2,"currency_code":"GBP","in_stock":true},{"title":"1\" x 8 BSW (2\" OD)","offer_id":57740556763511,"sku":"D30955","price":79.83,"currency_code":"GBP","in_stock":true},{"title":"1.1\/8\" x 7 BSW (3\" OD)","offer_id":57740556796279,"sku":"D31007","price":171.79,"currency_code":"GBP","in_stock":true},{"title":"1.1\/4\" x 7 BSW (3\" OD)","offer_id":57740556829047,"sku":"D31057","price":171.79,"currency_code":"GBP","in_stock":true},{"title":"1.3\/8\" x 6 BSW (3\" OD)","offer_id":57740556861815,"sku":"D31107","price":171.79,"currency_code":"GBP","in_stock":true},{"title":"1.1\/2\" x 6 BSW (3\" OD)","offer_id":57740556894583,"sku":"D31157","price":171.79,"currency_code":"GBP","in_stock":true},{"title":"1.3\/4\" x 5 BSW (4\" OD)","offer_id":57740556927351,"sku":"D31258","price":333.86,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0067\/9129\/9145\/files\/WisemanSplitDie_1e3d6cb7-6db1-4e70-a26f-cc79305d4ad6.png?v=1788643504"},{"product_id":"wiseman-hss-bsf-split-dies-british-standard-fine-right-hand-thread","title":"Wiseman HSS BSF Split Dies – British Standard Fine Right Hand Thread","description":"\u003cp data-pm-slice=\"1 3 []\" style=\"text-align: center;\"\u003e\u003cspan\u003eWiseman HSS BSF Split Dies are manufactured from High Speed Steel (HSS) and designed for cutting new external BSF (British Standard Fine) threads, as well as repairing, cleaning and restoring damaged or worn existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese round split dies feature an adjustable design, allowing minor adjustments to the thread fit when used with a suitable die stock. They are ideal for general engineering, thread cutting, maintenance and restoration applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBSF threads feature a 55° Whitworth thread profile with rounded crests and roots, but have a finer thread pitch than BSW (British Standard Whitworth) threads of the same nominal diameter. British Standard Fine threads are commonly found on older British machinery, classic vehicles, motorcycles, agricultural equipment and traditional engineering components.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eDesigned for right-hand thread cutting, these split dies are suitable for producing and restoring BSF threads on bolts, studs, rods and other externally threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHigh Speed Steel (HSS)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Durable construction for reliable thread cutting and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBSF Thread Form\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for British Standard Fine external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRight Hand Thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Standard clockwise tightening thread direction.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAdjustable Split Design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Allows minor adjustment of the thread fit when used with a suitable die stock.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRound Die Construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for use with compatible die stocks and die holders.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThread Cutting \u0026amp; Restoration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for cutting new external threads and repairing existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e55° Whitworth Thread Profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Features rounded crests and roots with a finer pitch than BSW.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRestoration Applications\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Particularly useful for classic vehicles and older British machinery.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eEngineering \u0026amp; Workshop Use\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for general machining, fabrication and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSuitable for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCutting new BSF external threads on rods, bolts and studs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRepairing damaged or worn BSF threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCleaning and restoring existing external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eClassic car and vintage motorcycle restoration.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eMaintenance of older British machinery and equipment.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAgricultural machinery repairs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eGeneral engineering and workshop machining.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufacturing replacement bolts and studs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eApplications requiring British Standard Fine threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eRecommended Use\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSelect the correct BSF split die size and threads per inch (TPI) to match the required external thread.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSecure the die in a compatible die stock or holder, ensuring the adjustment screws are correctly positioned. Prepare the workpiece to the appropriate diameter and apply a suitable chamfer to help the die start squarely.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eApply an appropriate cutting lubricant and rotate the die clockwise to cut the thread. Periodically reverse the die slightly to break and clear chips where appropriate for the material and cutting conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThe adjustable split design allows minor adjustments to the thread fit. For accurate results, check the finished thread using a suitable BSF thread gauge or correctly specified mating component.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eImportant\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eSuitable for BSF (British Standard Fine) right-hand external threads only.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eNot interchangeable with BSW, UNC, UNF, metric or other thread forms.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eAdjustable round split die for cutting and restoring external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eRequires a compatible die stock or die holder.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSelect the correct nominal diameter and TPI before use.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Rennie Tool Company","offers":[{"title":"3\/16\" x 32 BSF (13\/16\" OD)","offer_id":57740557025655,"sku":"D32001","price":22.34,"currency_code":"GBP","in_stock":true},{"title":"1\/4\" x 26 BSF (13\/16\" OD)","offer_id":57740557058423,"sku":"D32051","price":17.93,"currency_code":"GBP","in_stock":true},{"title":"5\/16\" x 22 BSF (1\" OD)","offer_id":57740557091191,"sku":"D32102","price":21.13,"currency_code":"GBP","in_stock":true},{"title":"3\/8\" x 20 BSF (1\" OD)","offer_id":57740557123959,"sku":"D32152","price":21.13,"currency_code":"GBP","in_stock":true},{"title":"7\/16\" x 18 BSF (1.5\/16\" OD)","offer_id":57740557156727,"sku":"D32203","price":33.05,"currency_code":"GBP","in_stock":true},{"title":"1\/2\" x 16 BSF (1.5\/16\" OD)","offer_id":57740557189495,"sku":"D32253","price":33.05,"currency_code":"GBP","in_stock":true},{"title":"9\/16\" x 16 BSF (1.5\/16\" OD)","offer_id":57740557222263,"sku":"D32303","price":38.77,"currency_code":"GBP","in_stock":true},{"title":"5\/8\" x 14 BSF (1.1\/2\" OD)","offer_id":57740557255031,"sku":"D32354","price":41.85,"currency_code":"GBP","in_stock":true},{"title":"3\/4\" x 12 BSF (2\" OD)","offer_id":57740557287799,"sku":"D32454","price":83.44,"currency_code":"GBP","in_stock":true},{"title":"7\/8\" x 11 BSF (2\" OD)","offer_id":57740557320567,"sku":"D32555","price":83.44,"currency_code":"GBP","in_stock":true},{"title":"1\" x 10 BSF (2\" OD)","offer_id":57740557353335,"sku":"D32605","price":83.44,"currency_code":"GBP","in_stock":true},{"title":"1.1\/8\" x 9 BSF (3\" OD)","offer_id":57740557386103,"sku":"D32657","price":171.79,"currency_code":"GBP","in_stock":true},{"title":"1.1\/4\" x 9 BSF (3\" OD)","offer_id":57740557418871,"sku":"D32707","price":171.79,"currency_code":"GBP","in_stock":true},{"title":"1.3\/8\" x 8 BSF (3\" OD)","offer_id":57740557451639,"sku":"D32757","price":171.79,"currency_code":"GBP","in_stock":true},{"title":"1.1\/2\" x 8 BSF (4\" OD)","offer_id":57740557484407,"sku":"D32808","price":315.58,"currency_code":"GBP","in_stock":true},{"title":"2\" x 7 BSF (4\" OD)","offer_id":57740557517175,"sku":"D32958","price":315.58,"currency_code":"GBP","in_stock":true},{"title":"2.1\/4\" x 6 BSF (4\" OD)","offer_id":57740557549943,"sku":"D32978","price":315.58,"currency_code":"GBP","in_stock":true},{"title":"2.1\/2\" x 6 BSF (4\" OD)","offer_id":57740557582711,"sku":"D32998","price":315.58,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0067\/9129\/9145\/files\/WisemanSplitDie_1e3d6cb7-6db1-4e70-a26f-cc79305d4ad6.png?v=1788643504"},{"product_id":"wiseman-hss-bsb-split-dies-british-standard-brass-right-hand-thread","title":"Wiseman HSS BSB Split Dies – British Standard Brass Right Hand Thread","description":"\u003cp data-pm-slice=\"1 3 []\" style=\"text-align: center;\"\u003e\u003cspan\u003eWiseman HSS BSB Split Dies are manufactured from High Speed Steel (HSS) and designed for cutting new external BSB (British Standard Brass) threads, as well as repairing, cleaning and restoring damaged or worn existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese round split dies feature an adjustable design, allowing minor adjustments to the thread fit when used with a suitable die stock. They are suitable for precision engineering, instrument making, restoration and general workshop applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBritish Standard Brass threads feature a 55° Whitworth thread profile with rounded crests and roots. Unlike BSW and BSF threads, which use different pitches depending on the nominal diameter, the BSB thread series uses a constant pitch of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e26 threads per inch (TPI)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e across its standard range of sizes.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBSB threads are traditionally associated with brass components, electrical fittings, instruments, model engineering and specialist threaded parts. Although commonly used with brass, the BSB designation refers to the thread form and dimensions rather than restricting the thread to a particular material.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eDesigned for right-hand thread cutting, these split dies are suitable for producing and restoring BSB threads on rods, studs, fittings and other externally threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHigh Speed Steel (HSS)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Durable construction for reliable thread cutting and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBSB Thread Form\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for British Standard Brass external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRight Hand Thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Standard clockwise tightening thread direction.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAdjustable Split Design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Allows minor adjustment of the thread fit when used with a suitable die stock.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRound Die Construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for use with compatible die stocks and die holders.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e26 TPI Thread Pitch\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Constant 26 threads per inch across the standard BSB thread series.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e55° Whitworth Thread Profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Features rounded crests and roots.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThread Cutting \u0026amp; Restoration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for producing new threads and restoring existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSpecialist Engineering Applications\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for instrument making, model engineering and restoration work.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSuitable for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCutting new BSB external threads on rods, studs and fittings.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRepairing damaged or worn British Standard Brass threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCleaning and restoring existing external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBrass fittings and threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eElectrical fittings and traditional equipment.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eInstrument making and precision engineering.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eModel engineering and miniature machinery.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRestoration of vintage equipment and specialist components.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eGeneral engineering and workshop machining.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eRecommended Use\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSelect the correct BSB split die diameter to match the required external thread. Standard British Standard Brass threads use a pitch of 26 TPI.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSecure the die in a compatible die stock or holder, ensuring the adjustment screws are correctly positioned. Prepare the workpiece to the appropriate diameter and apply a suitable chamfer to help the die start squarely.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eApply a cutting lubricant appropriate to the workpiece material and rotate the die clockwise to cut the thread. Periodically reverse the die slightly to break and clear chips where appropriate for the material and cutting conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThe adjustable split design allows minor adjustments to the thread fit. Check the finished thread using a suitable BSB thread gauge or correctly specified mating component.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eImportant\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eSuitable for BSB (British Standard Brass) right-hand external threads only.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eStandard BSB threads use \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e26 TPI\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e regardless of nominal thread diameter.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eFeatures a 55° Whitworth thread profile.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eNot interchangeable with BSW, BSF, BSP, metric or Unified threads solely because the nominal diameter or pitch appears similar.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eAdjustable round split die for cutting and restoring external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eRequires a compatible die stock or die holder.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSelect the correct nominal thread diameter before use.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Rennie Tool Company","offers":[{"title":"5\/16\" x 26 BSB (1\" OD)","offer_id":57740557615479,"sku":"D34001","price":25.91,"currency_code":"GBP","in_stock":true},{"title":"3\/8\" x 26 BSB (1\" OD)","offer_id":57740557648247,"sku":"D34052","price":25.91,"currency_code":"GBP","in_stock":true},{"title":"7\/16\" x 26 BSB (1.5\/16\" OD)","offer_id":57740557681015,"sku":"D34103","price":37.39,"currency_code":"GBP","in_stock":true},{"title":"1\/2\" x 26 BSB (1.5\/16\" OD)","offer_id":57740557713783,"sku":"D34153","price":37.39,"currency_code":"GBP","in_stock":true},{"title":"9\/16\" x 26 BSB (1.5\/16\" OD)","offer_id":57740557746551,"sku":"D34203","price":64.0,"currency_code":"GBP","in_stock":true},{"title":"5\/8\" x 26 BSB (1.1\/2\" OD)","offer_id":57740557779319,"sku":"D34254","price":79.16,"currency_code":"GBP","in_stock":true},{"title":"3\/4\" x 26 BSB (1.1\/2\" OD)","offer_id":57740557812087,"sku":"D34304","price":84.48,"currency_code":"GBP","in_stock":true},{"title":"7\/8\" x 26 BSB (2\" OD)","offer_id":57740557844855,"sku":"D34354","price":114.59,"currency_code":"GBP","in_stock":true},{"title":"1\" x 26 BSB (2\" OD)","offer_id":57740557877623,"sku":"D34404","price":114.59,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0067\/9129\/9145\/files\/WisemanSplitDie_1e3d6cb7-6db1-4e70-a26f-cc79305d4ad6.png?v=1788643504"},{"product_id":"wiseman-hss-ba-split-dies-british-association-right-hand-thread","title":"Wiseman HSS BA Split Dies – British Association Right Hand Thread","description":"\u003cp data-pm-slice=\"1 3 []\" style=\"text-align: center;\"\u003e\u003cspan\u003eWiseman HSS BA Split Dies are manufactured from High Speed Steel (HSS) and designed for cutting new external BA (British Association) threads, as well as repairing, cleaning and restoring damaged or worn existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese round split dies feature an adjustable design, allowing minor adjustments to the thread fit when used with a suitable die stock. They are particularly useful for precision engineering, instrument making, model engineering, electrical equipment maintenance and restoration applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBritish Association threads feature a distinctive \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e47.5° thread profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e with rounded crests and roots. Unlike conventional metric or imperial thread series, BA threads are identified by numbered sizes, with larger BA numbers representing smaller thread diameters.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBA threads were widely used in electrical equipment, scientific instruments, model engineering, small machinery and precision mechanical assemblies. They remain particularly relevant for maintaining and restoring older British equipment and components.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eDesigned for right-hand thread cutting, these split dies are suitable for producing and restoring BA threads on screws, studs, rods and other externally threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHigh Speed Steel (HSS)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Durable construction for reliable thread cutting and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBA Thread Form\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for British Association external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRight Hand Thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Standard clockwise tightening thread direction.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAdjustable Split Design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Allows minor adjustment of the thread fit when used with a suitable die stock.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRound Die Construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for use with compatible die stocks and die holders.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e47.5° Thread Profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – British Association thread form with rounded crests and roots.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eNumbered Thread Sizes\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – BA sizes are designated by numbers rather than nominal inch diameters.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThread Cutting \u0026amp; Restoration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for cutting new external threads and repairing existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePrecision Engineering Applications\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Particularly useful for small threaded components and specialist restoration work.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSuitable for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCutting new BA external threads on screws, rods and studs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRepairing damaged or worn British Association threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCleaning and restoring existing external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eModel engineering and miniature machinery.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eElectrical equipment and instrument repairs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eScientific instrument manufacturing and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eVintage machinery and equipment restoration.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePrecision engineering and workshop machining.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufacturing replacement screws and specialist threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eRecommended Use\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSelect the correct BA split die size to match the required external thread. Each BA size has its own specified major diameter and thread pitch.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSecure the die in a compatible die stock or holder, ensuring the adjustment screws are correctly positioned. Prepare the workpiece to the appropriate diameter and apply a suitable chamfer to help the die start squarely.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eApply a suitable cutting lubricant and rotate the die clockwise to cut the thread. Periodically reverse the die slightly to break and clear chips where appropriate for the material and cutting conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThe adjustable split design allows minor adjustments to the thread fit. For accurate results, check the finished thread using a suitable BA thread gauge or correctly specified mating component.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eExtra care should be taken when cutting smaller BA thread sizes due to the reduced diameter and increased risk of damaging delicate workpieces.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eImportant\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eSuitable for BA (British Association) right-hand external threads only.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eFeatures a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e47.5° thread profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e with rounded crests and roots.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eBA thread sizes are numbered, with higher numbers representing smaller nominal diameters.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eNot interchangeable with metric, BSW, BSF, UNC, UNF or other thread forms.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eAdjustable round split die for cutting and restoring external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eRequires a compatible die stock or die holder.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eEnsure the correct BA size is selected before use.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Rennie Tool Company","offers":[{"title":"12 BA (13\/16\" OD)","offer_id":57740557943159,"sku":"D35051","price":40.47,"currency_code":"GBP","in_stock":true},{"title":"10 BA (13\/16\" OD)","offer_id":57740557975927,"sku":"D35081","price":40.47,"currency_code":"GBP","in_stock":true},{"title":"9 BA (13\/16\" OD)","offer_id":57740558008695,"sku":"D35101","price":40.47,"currency_code":"GBP","in_stock":true},{"title":"8 BA (13\/16\" OD)","offer_id":57740558041463,"sku":"D35151","price":31.03,"currency_code":"GBP","in_stock":true},{"title":"7 BA (13\/16\" OD)","offer_id":57740558074231,"sku":"D35201","price":31.03,"currency_code":"GBP","in_stock":true},{"title":"6 BA (13\/16\" OD)","offer_id":57740558106999,"sku":"D35251","price":23.22,"currency_code":"GBP","in_stock":true},{"title":"5 BA (13\/16\" OD)","offer_id":57740558139767,"sku":"D35351","price":31.03,"currency_code":"GBP","in_stock":true},{"title":"4 BA (13\/16\" OD)","offer_id":57740558172535,"sku":"D35401","price":23.22,"currency_code":"GBP","in_stock":true},{"title":"3 BA (13\/16\" OD)","offer_id":57740558205303,"sku":"D35451","price":31.03,"currency_code":"GBP","in_stock":true},{"title":"2 BA (13\/16\" OD)","offer_id":57740558238071,"sku":"D35501","price":23.22,"currency_code":"GBP","in_stock":true},{"title":"1 BA (13\/16\" OD)","offer_id":57740558270839,"sku":"D35551","price":31.03,"currency_code":"GBP","in_stock":true},{"title":"0 BA (13\/16\" OD)","offer_id":57740558303607,"sku":"D35601","price":23.22,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0067\/9129\/9145\/files\/WisemanSplitDie_1e3d6cb7-6db1-4e70-a26f-cc79305d4ad6.png?v=1788643504"},{"product_id":"wiseman-hss-whit-me-split-dies-model-engineer-whitworth-right-hand-thread","title":"Wiseman HSS WHIT (ME) Split Dies – Model Engineer Whitworth Right Hand Thread","description":"\u003cp data-pm-slice=\"1 3 []\" style=\"text-align: center;\"\u003e\u003cspan\u003eWiseman HSS WHIT (ME) Split Dies are manufactured from High Speed Steel (HSS) and designed for cutting new external Model Engineer (ME) threads, as well as repairing, cleaning and restoring damaged or worn existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese round split dies feature an adjustable design, allowing minor adjustments to the thread fit when used with a suitable die stock. They are particularly useful for model engineering, precision machining, miniature mechanical assemblies and restoration applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eModel Engineer Whitworth threads feature a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e55° Whitworth thread profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e with rounded crests and roots. The ME thread series commonly uses fine pitches of 32 or 40 threads per inch (TPI), depending on the specified size and application.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese fine-pitch threads are traditionally used in model steam engines, miniature locomotives, model boilers, small mechanical assemblies and specialist engineering projects where relatively fine threads are required on smaller components.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eDesigned for right-hand thread cutting, these split dies are suitable for producing and restoring Model Engineer Whitworth threads on rods, studs, fittings and other externally threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHigh Speed Steel (HSS)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Durable construction for reliable thread cutting and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eModel Engineer (ME) Thread Form\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for Model Engineer Whitworth external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRight Hand Thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Standard clockwise tightening thread direction.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAdjustable Split Design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Allows minor adjustment of the thread fit when used with a suitable die stock.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRound Die Construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for use with compatible die stocks and die holders.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e55° Whitworth Thread Profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Features rounded crests and roots.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFine Thread Pitches\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Commonly available in 32 TPI and 40 TPI configurations.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThread Cutting \u0026amp; Restoration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for producing new external threads and restoring existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eModel Engineering Applications\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Particularly useful for miniature machinery and precision components.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSuitable for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCutting new Model Engineer Whitworth external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRepairing damaged or worn ME threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCleaning and restoring existing external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eModel steam engine construction and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eMiniature locomotive and railway model engineering.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eModel boiler fittings, where the thread specification and applicable safety requirements permit.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePrecision engineering and small mechanical assemblies.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufacturing miniature threaded rods, studs and fittings.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRestoration of vintage model engineering equipment.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eRecommended Use\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSelect the correct Model Engineer Whitworth split die diameter and thread pitch. ME threads are commonly specified in 32 TPI or 40 TPI, and the exact pitch must match the intended component.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSecure the die in a compatible die stock or holder, ensuring the adjustment screws are correctly positioned. Prepare the workpiece to the appropriate diameter and apply a suitable chamfer to help the die start squarely.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eApply a suitable cutting lubricant and rotate the die clockwise to cut the thread. Periodically reverse the die slightly to break and clear chips where appropriate for the material and cutting conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThe adjustable split design allows minor adjustments to the thread fit. Check the finished thread using a suitable thread gauge or correctly specified mating component.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eExtra care should be taken when cutting fine threads on small-diameter components to avoid excessive cutting pressure or damage to the workpiece.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eImportant\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eSuitable for Model Engineer Whitworth (ME) right-hand external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eFeatures a 55° Whitworth thread profile.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eCommon ME thread pitches include 32 TPI and 40 TPI.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eNot interchangeable with BSW, BSF, BSB, BSP, metric or Unified threads unless the complete thread specification matches.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eAdjustable round split die for cutting and restoring external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eRequires a compatible die stock or die holder.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eSelect the correct nominal diameter and TPI before use.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cspan\u003eThread Reference:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Model Engineer Whitworth (ME) thread series.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Rennie Tool Company","offers":[{"title":"5\/32\" x 40 WHIT ( ME) (13\/16\" OD)","offer_id":57740558926199,"sku":"D36001","price":31.03,"currency_code":"GBP","in_stock":true},{"title":"3\/16\" x 40 WHIT (ME) (13\/16\" OD)","offer_id":57740558958967,"sku":"D36051","price":31.03,"currency_code":"GBP","in_stock":true},{"title":"7\/32\" x 40 WHIT (ME) (13\/16\" OD)","offer_id":57740558991735,"sku":"D36101","price":31.03,"currency_code":"GBP","in_stock":true},{"title":"1\/4\" x 40 WHIT (ME) (13\/16\" OD)","offer_id":57740559024503,"sku":"D36151","price":31.03,"currency_code":"GBP","in_stock":true},{"title":"9\/32\" x 32 WHIT (ME) (13\/16\" OD)","offer_id":57740559057271,"sku":"D36201","price":31.03,"currency_code":"GBP","in_stock":true},{"title":"5\/16\" x 32 WHIT (ME) (1\" OD)","offer_id":57740559090039,"sku":"D36252","price":34.89,"currency_code":"GBP","in_stock":true},{"title":"5\/16\" x 40 WHIT (ME) (1\" OD)","offer_id":57740559122807,"sku":"D36302","price":34.89,"currency_code":"GBP","in_stock":true},{"title":"3\/8\" x 32 WHIT (ME) (1\" OD)","offer_id":57740559155575,"sku":"D36352","price":34.89,"currency_code":"GBP","in_stock":true},{"title":"3\/8\" x 40 WHIT (ME) (1\" OD)","offer_id":57740559188343,"sku":"D36402","price":34.89,"currency_code":"GBP","in_stock":true},{"title":"7\/16\" x 32 WHIT (ME) (1.5\/16\" OD)","offer_id":57740559221111,"sku":"D36453","price":39.98,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0067\/9129\/9145\/files\/WisemanSplitDie_1e3d6cb7-6db1-4e70-a26f-cc79305d4ad6.png?v=1788643504"},{"product_id":"wiseman-hss-bscy-split-dies-british-standard-cycle-right-hand-thread","title":"Wiseman HSS BSCY Split Dies – British Standard Cycle Right Hand Thread","description":"\u003cp data-pm-slice=\"1 3 []\" style=\"text-align: center;\"\u003e\u003cspan\u003eWiseman HSS BSCY Split Dies are manufactured from High Speed Steel (HSS) and designed for cutting new external BSCY (British Standard Cycle) threads, as well as repairing, cleaning and restoring damaged or worn existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese round split dies feature an adjustable design, allowing minor adjustments to the thread fit when used with a suitable die stock. They are particularly useful for bicycle restoration, vintage motorcycle maintenance, precision engineering and specialist workshop applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBritish Standard Cycle threads, also known as Cycle Engineers' Institute (CEI) threads, feature a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e60° thread profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e with rounded crests and roots. Unlike British Standard Whitworth threads, which use a 55° profile, BSCY threads use a 60° profile and are commonly associated with a pitch of 26 threads per inch (TPI), although other pitches exist within the cycle thread series.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBSCY threads were traditionally used in British bicycles, motorcycles and associated mechanical components. They remain particularly relevant for restoring vintage British motorcycles, classic bicycles and specialist machinery requiring original cycle thread specifications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eDesigned for right-hand thread cutting, these split dies are suitable for producing and restoring BSCY threads on bolts, studs, rods, fittings and other externally threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHigh Speed Steel (HSS)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Durable construction for reliable thread cutting and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBSCY Thread Form\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for British Standard Cycle external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRight Hand Thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Standard clockwise tightening thread direction.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAdjustable Split Design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Allows minor adjustment of the thread fit when used with a suitable die stock.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRound Die Construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for use with compatible die stocks and die holders.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e60° Thread Profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – British Standard Cycle thread form with rounded crests and roots.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e26 TPI Thread Pitch\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Commonly used throughout the BSCY thread series, with other pitches also specified.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThread Cutting \u0026amp; Restoration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for cutting new external threads and repairing existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eClassic Vehicle Restoration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Particularly useful for vintage British motorcycles and bicycles.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSuitable for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCutting new British Standard Cycle external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRepairing damaged or worn BSCY threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCleaning and restoring existing external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eVintage British motorcycle restoration and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eClassic bicycle repairs and restoration.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufacturing replacement bolts, studs and threaded fittings.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePrecision engineering and specialist workshop machining.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eMaintenance of older British mechanical equipment.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eApplications requiring British Standard Cycle or CEI threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eRecommended Use\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSelect the correct BSCY split die diameter and threads per inch (TPI) to match the required external thread. Although 26 TPI is common, not all British Standard Cycle threads use the same pitch.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSecure the die in a compatible die stock or holder, ensuring the adjustment screws are correctly positioned. Prepare the workpiece to the appropriate diameter and apply a suitable chamfer to help the die start squarely.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eApply a suitable cutting lubricant and rotate the die clockwise to cut the thread. Periodically reverse the die slightly to break and clear chips where appropriate for the material and cutting conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThe adjustable split design allows minor adjustments to the thread fit. Check the finished thread using a suitable BSCY thread gauge or correctly specified mating component.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eWhen restoring vintage motorcycles or bicycles, verify the original thread specification before cutting, as some components may use BSW, BSF, BSP or other thread forms.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eImportant\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eSuitable for BSCY (British Standard Cycle) right-hand external threads only.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eAlso commonly referred to as CEI (Cycle Engineers' Institute) threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eFeatures a 60° thread profile with rounded crests and roots.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eCommonly uses 26 TPI, although other pitches exist.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eNot interchangeable with BSW, BSF, BSB, UNC, UNF or metric threads solely on the basis of nominal diameter or TPI.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eAdjustable round split die for cutting and restoring external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eRequires a compatible die stock or die holder.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eEnsure the correct nominal diameter and TPI are selected before use.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Rennie Tool Company","offers":[{"title":"1\/4\" x 26 BSCY (13\/16\" OD)","offer_id":57740559712631,"sku":"D36501","price":36.67,"currency_code":"GBP","in_stock":true},{"title":"5\/16\" x 26 BSCY (1\" OD)","offer_id":57740559745399,"sku":"D36522","price":38.76,"currency_code":"GBP","in_stock":true},{"title":"3\/8\" x 26 BSCY (1\" OD)","offer_id":57740559778167,"sku":"D36542","price":38.76,"currency_code":"GBP","in_stock":true},{"title":"7\/16\" x 26 BSCY (1.5\/16\" OD)","offer_id":57740559810935,"sku":"D36563","price":58.03,"currency_code":"GBP","in_stock":true},{"title":"1\/2\" x 26 BSCY (1.5\/16\" OD)","offer_id":57740559843703,"sku":"D36603","price":58.03,"currency_code":"GBP","in_stock":true},{"title":"3\/4\" x 26 BSCY (1.1\/2\" OD)","offer_id":57740559876471,"sku":"D36654","price":86.83,"currency_code":"GBP","in_stock":true},{"title":"1\" x 26  BSCY (2\" OD)","offer_id":57740559909239,"sku":"D36705","price":106.39,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0067\/9129\/9145\/files\/WisemanSplitDie_1e3d6cb7-6db1-4e70-a26f-cc79305d4ad6.png?v=1788643504"},{"product_id":"wiseman-hss-bsp-split-dies-british-standard-pipe-parallel-right-hand-thread","title":"Wiseman HSS BSP Split Dies – British Standard Pipe Parallel Right Hand Thread","description":"\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp data-pm-slice=\"1 3 []\" style=\"text-align: center;\"\u003e\u003cspan\u003eWiseman HSS BSP Split Dies are manufactured from High Speed Steel (HSS) and designed for cutting new external BSP (British Standard Pipe) parallel threads, as well as repairing, cleaning and restoring damaged or worn existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese round split dies feature an adjustable design, allowing minor adjustments to the thread fit when used with a suitable die stock. They are particularly useful for pipe fitting, general engineering, machinery maintenance and workshop applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBSP parallel threads, also known as BSPP or G threads, feature a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e55° Whitworth thread profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e with rounded crests and roots. Unlike BSPT (British Standard Pipe Taper) threads, BSP parallel threads maintain a constant diameter along the threaded section.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBSP parallel threads are widely used in plumbing, hydraulic systems, pneumatic equipment, industrial machinery and mechanical fittings. They are commonly used where a sealing washer, O-ring, gasket or other suitable sealing arrangement provides the seal rather than the thread itself.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eDesigned for right-hand thread cutting, these split dies are suitable for producing and restoring BSP parallel external threads on suitable pipes, fittings, adapters and other threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHigh Speed Steel (HSS)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Durable construction for reliable thread cutting and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBSP Parallel Thread Form\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for British Standard Pipe Parallel external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRight Hand Thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Standard clockwise tightening thread direction.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAdjustable Split Design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Allows minor adjustment to the thread fit when used with a suitable die stock.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRound Die Construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for use with compatible die stocks and die holders.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e55° Whitworth Thread Profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Features rounded crests and roots.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eParallel Thread Design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Produces threads with a constant nominal major diameter along their length.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThread Cutting \u0026amp; Restoration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for cutting new external threads and repairing existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eEngineering \u0026amp; Pipe Fitting Applications\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for hydraulic, pneumatic and general mechanical fittings.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSuitable for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCutting new BSP parallel external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRepairing damaged or worn BSPP threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCleaning and restoring existing external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePlumbing and pipe fitting applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eHydraulic fittings and adapters.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePneumatic equipment and compressed air fittings.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eIndustrial machinery and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eGeneral engineering and workshop machining.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufacturing replacement threaded fittings and adapters.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eRecommended Use\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSelect the correct BSP split die size and thread pitch to match the required external thread.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBSP sizes are designated by nominal pipe sizes rather than the actual outside diameter of the thread. For example, a 1\/2\" BSP thread has an external major diameter of approximately 20.96mm, not 12.7mm.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSecure the die in a compatible die stock or holder, ensuring the adjustment screws are correctly positioned. Prepare the workpiece to the appropriate diameter and apply a suitable chamfer to help the die start squarely.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eApply an appropriate cutting lubricant and rotate the die clockwise to cut the thread. Periodically reverse the die slightly to break and clear chips where appropriate for the material and cutting conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThe adjustable split design allows minor adjustments to the thread fit. Check the finished thread using a suitable BSP parallel thread gauge or correctly specified mating component.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eWhere the threaded connection is required to seal against pressure, ensure that the appropriate sealing method is used and that the complete connection is suitable for the intended application.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eImportant\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eSuitable for BSP (British Standard Pipe Parallel \/ BSPP) right-hand external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAlso commonly identified by the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eG thread designation\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eFeatures a 55° Whitworth thread profile.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eProduces parallel threads, not tapered threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eNot interchangeable with BSPT or NPT dies.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBSP nominal thread sizes do not correspond directly to the measured external thread diameter.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBSP parallel threads generally require a separate sealing arrangement where a pressure-tight connection is needed.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAdjustable round split die for cutting and restoring external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRequires a compatible die stock or die holder.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Rennie Tool Company","offers":[{"title":"1\/8\" x 28 BSP (1\" OD)","offer_id":57740559974775,"sku":"D50551","price":17.33,"currency_code":"GBP","in_stock":true},{"title":"1\/4\" x 19 BSP (1.5\/16\" OD)","offer_id":57740560007543,"sku":"D50602","price":25.99,"currency_code":"GBP","in_stock":true},{"title":"3\/8\" x 19 BSP (1.1\/2\" OD)","offer_id":57740560040311,"sku":"D50653","price":31.03,"currency_code":"GBP","in_stock":true},{"title":"1\/2\" x 14 BSP (1.1\/2\" OD)","offer_id":57740560073079,"sku":"D50703","price":35.43,"currency_code":"GBP","in_stock":true},{"title":"5\/8\" x 14 BSP (2\" OD)","offer_id":57740560105847,"sku":"D50754","price":64.27,"currency_code":"GBP","in_stock":true},{"title":"3\/4\" x 14 BSP (2\" OD)","offer_id":57740560138615,"sku":"D50804","price":64.16,"currency_code":"GBP","in_stock":true},{"title":"7\/8\" x 14 BSP (2\" OD)","offer_id":57740560171383,"sku":"D50854","price":64.16,"currency_code":"GBP","in_stock":true},{"title":"1\" x 11 BSP (3\" OD)","offer_id":57740560204151,"sku":"D51006","price":129.71,"currency_code":"GBP","in_stock":true},{"title":"1.1\/4\" x 11 BSP (3\" OD)","offer_id":57740560236919,"sku":"D51056","price":113.2,"currency_code":"GBP","in_stock":true},{"title":"1.1\/2\" x 11 BSP (3\" OD)","offer_id":57740560269687,"sku":"D51106","price":129.71,"currency_code":"GBP","in_stock":true},{"title":"2\" x 11 BSP (4\" OD)","offer_id":57740560302455,"sku":"D51208","price":308.81,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0067\/9129\/9145\/files\/WisemanSplitDie_1e3d6cb7-6db1-4e70-a26f-cc79305d4ad6.png?v=1788643504"},{"product_id":"wiseman-hss-unc-left-hand-split-dies-unified-national-coarse-thread","title":"Wiseman HSS UNC Left Hand Split Dies – Unified National Coarse Thread","description":"\u003cp data-pm-slice=\"1 3 []\" style=\"text-align: center;\"\u003e\u003cspan\u003eWiseman HSS UNC Left Hand Split Dies are manufactured from High Speed Steel (HSS) and designed for cutting new external UNC (Unified National Coarse) left-hand threads, as well as repairing, cleaning and restoring damaged or worn existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese round split dies feature an adjustable design, allowing minor adjustments to the thread fit when used with a suitable die stock. They are particularly useful for general engineering, machinery maintenance, specialist repairs and workshop applications requiring left-hand threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eUNC threads feature a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e60° Unified thread profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and a relatively coarse pitch compared with UNF (Unified National Fine) threads of the same nominal diameter. The coarser thread pitch makes UNC threads widely used in general engineering, machinery, equipment assembly and industrial applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eUnlike standard right-hand threads, \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eleft-hand UNC threads tighten anticlockwise and loosen clockwise\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. They are commonly used in applications where the direction of rotation, mechanical movement or equipment design requires a reverse-threaded fastening.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese split dies are suitable for producing and restoring left-hand UNC threads on bolts, studs, rods, shafts and other externally threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHigh Speed Steel (HSS)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Durable construction for reliable thread cutting and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eUNC Thread Form\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for Unified National Coarse external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eLeft Hand Thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Tightens anticlockwise and loosens clockwise.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAdjustable Split Design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Allows minor adjustment of the thread fit when used with a suitable die stock.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRound Die Construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for use with compatible die stocks and die holders.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e60° Thread Profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Unified thread form with a coarse thread pitch.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThread Cutting \u0026amp; Restoration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for cutting new external threads and repairing existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eReverse Thread Applications\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for components requiring left-hand threaded fastenings.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eEngineering \u0026amp; Workshop Use\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for general machining, fabrication and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSuitable for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCutting new UNC left-hand external threads on rods, bolts and studs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRepairing damaged or worn UNC left-hand threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCleaning and restoring existing external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufacturing left-hand threaded shafts and fasteners.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eMachinery and mechanical equipment maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRotating assemblies requiring reverse-threaded fastenings.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eSpecialist automotive and industrial engineering applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eGeneral engineering and workshop machining.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufacturing replacement left-hand threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eRecommended Use\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSelect the correct UNC left-hand split die diameter and threads per inch (TPI) to match the required external thread.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSecure the die in a compatible die stock or holder, ensuring the adjustment screws are correctly positioned. Prepare the workpiece to the appropriate diameter and apply a suitable chamfer to help the die start squarely.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eApply a suitable cutting lubricant and rotate the die \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eanticlockwise to cut the left-hand thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, viewed from the starting end of the workpiece. Periodically reverse the die clockwise slightly to help break and clear chips where appropriate for the material and cutting conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThe adjustable split design allows minor adjustments to the thread fit. For accurate results, check the finished thread using a suitable UNC left-hand thread gauge or correctly specified mating component.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eEnsure that the die is started squarely and that the correct cutting direction is maintained throughout the operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eImportant\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli style=\"list-style-type: none;\"\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eSuitable for \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eUNC (Unified National Coarse) left-hand external threads only\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eLeft-hand threads tighten anticlockwise and loosen clockwise.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eNot suitable for cutting standard right-hand UNC threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eFeatures a 60° Unified thread profile.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eNot interchangeable with UNF, UNEF, metric, BSW or other thread forms.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eAdjustable round split die for cutting and restoring external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eRequires a compatible die stock or die holder.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eEnsure the correct nominal diameter and TPI are selected before use.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Rennie Tool Company","offers":[{"title":"1\/4\" x 20 UNC Left Hand (13\/16\" OD)","offer_id":57740560335223,"sku":"D20501L","price":42.95,"currency_code":"GBP","in_stock":true},{"title":"5\/16\" x 18 UNC Left Hand (1\" OD)","offer_id":57740560367991,"sku":"D20552L","price":55.98,"currency_code":"GBP","in_stock":true},{"title":"3\/8\" x 16 UNC Left Hand (1\" OD)","offer_id":57740560400759,"sku":"D20602L","price":55.98,"currency_code":"GBP","in_stock":true},{"title":"7\/16\" x 14 UNC Left Hand (1.5\/16\" OD)","offer_id":57740560433527,"sku":"D20653L","price":65.19,"currency_code":"GBP","in_stock":true},{"title":"1\/2\" x 13 UNC Left Hand (1.5\/16\" OD)","offer_id":57740560466295,"sku":"D20703L","price":65.19,"currency_code":"GBP","in_stock":true},{"title":"9\/16\" x 12 UNC Left Hand (1.5\/16\" OD)","offer_id":57740560499063,"sku":"D20753L","price":65.19,"currency_code":"GBP","in_stock":true},{"title":"5\/8\" x 11 UNC Left Hand (1.1\/2\" OD)","offer_id":57740560531831,"sku":"D20804L","price":84.64,"currency_code":"GBP","in_stock":true},{"title":"3\/4\" x 10 UNC Left Hand (1.1\/2\" OD)","offer_id":57740560564599,"sku":"D20854L","price":84.64,"currency_code":"GBP","in_stock":true},{"title":"7\/8\" x 9 UNC Left Hand (2\" OD)","offer_id":57740560597367,"sku":"D20905L","price":125.64,"currency_code":"GBP","in_stock":true},{"title":"1\" x 8 UNC Left Hand (2\" OD)","offer_id":57740560630135,"sku":"D20955L","price":125.64,"currency_code":"GBP","in_stock":true},{"title":"1.1\/4\" x 7 UNC Left Hand (3\" OD)","offer_id":57740560662903,"sku":"D21057L","price":237.74,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0067\/9129\/9145\/files\/WisemanSplitDie_1e3d6cb7-6db1-4e70-a26f-cc79305d4ad6.png?v=1788643504"},{"product_id":"wiseman-hss-unf-left-hand-split-dies-unified-national-fine-lh-thread","title":"Wiseman HSS UNF Left Hand Split Dies – Unified National Fine LH Thread","description":"\u003cp data-pm-slice=\"1 3 []\" style=\"text-align: center;\"\u003e\u003cspan\u003eWiseman HSS UNF Left Hand Split Dies are manufactured from High Speed Steel (HSS) and designed for cutting new external UNF (Unified National Fine) left-hand threads, as well as repairing, cleaning and restoring damaged or worn existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese round split dies feature an adjustable design, allowing minor adjustments to the thread fit when used with a suitable die stock. They are particularly useful for precision engineering, machinery maintenance, specialist repairs and workshop applications requiring fine-pitch left-hand threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eUNF threads feature a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e60° Unified thread profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e with a finer pitch than UNC (Unified National Coarse) threads of the same nominal diameter. Unified National Fine threads are widely used in automotive engineering, machinery, mechanical assemblies and applications requiring finer thread adjustment.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eUnlike standard right-hand threads, \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eleft-hand UNF threads tighten anticlockwise and loosen clockwise\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. They are used in applications where the direction of rotation, mechanical movement or equipment design requires a reverse-threaded fastening.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese split dies are suitable for producing and restoring left-hand UNF threads on bolts, studs, rods, shafts and other externally threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHigh Speed Steel (HSS)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Durable construction for reliable thread cutting and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eUNF Thread Form\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for Unified National Fine external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eLeft Hand Thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Tightens anticlockwise and loosens clockwise.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAdjustable Split Design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Allows minor adjustment of the thread fit when used with a suitable die stock.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRound Die Construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for use with compatible die stocks and die holders.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e60° Thread Profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Unified thread form with a fine thread pitch.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThread Cutting \u0026amp; Restoration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for cutting new external threads and repairing existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eReverse Thread Applications\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for components requiring left-hand threaded fastenings.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eEngineering \u0026amp; Workshop Use\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for precision machining, fabrication and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSuitable for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCutting new UNF left-hand external threads on rods, bolts and studs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRepairing damaged or worn UNF left-hand threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCleaning and restoring existing external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufacturing left-hand threaded shafts and fasteners.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eMachinery and mechanical equipment maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRotating assemblies requiring reverse-threaded fastenings.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eSpecialist automotive and industrial engineering applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePrecision engineering and workshop machining.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufacturing replacement left-hand threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eRecommended Use\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSelect the correct UNF left-hand split die diameter and threads per inch (TPI) to match the required external thread.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSecure the die in a compatible die stock or holder, ensuring the adjustment screws are correctly positioned. Prepare the workpiece to the appropriate diameter and apply a suitable chamfer to help the die start squarely.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eApply a suitable cutting lubricant and rotate the die \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eanticlockwise to cut the left-hand thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, viewed from the starting end of the workpiece. Periodically reverse the die clockwise slightly to help break and clear chips where appropriate for the material and cutting conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThe adjustable split design allows minor adjustments to the thread fit. For accurate results, check the finished thread using a suitable UNF left-hand thread gauge or correctly specified mating component.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eEnsure that the die is started squarely and that the correct cutting direction is maintained throughout the operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eImportant\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eSuitable for \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eUNF (Unified National Fine) left-hand external threads only\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eLeft-hand threads tighten anticlockwise and loosen clockwise.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eNot suitable for cutting standard right-hand UNF threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eFeatures a 60° Unified thread profile.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eNot interchangeable with UNC, UNEF, metric, BSF or other thread forms.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eAdjustable round split die for cutting and restoring external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eRequires a compatible die stock or die holder.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eEnsure the correct nominal diameter and TPI are selected before use.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Rennie Tool Company","offers":[{"title":"10-32 UNF Left Hand (13\/16\" OD)","offer_id":57740560761207,"sku":"D22401L","price":46.71,"currency_code":"GBP","in_stock":true},{"title":"1\/4\" x 28 UNF Left Hand (13\/16\" OD)","offer_id":57740560793975,"sku":"D22501L","price":46.71,"currency_code":"GBP","in_stock":true},{"title":"5\/16\" x 24 UNF Left Hand (1\" OD)","offer_id":57740560826743,"sku":"D22552L","price":56.11,"currency_code":"GBP","in_stock":true},{"title":"3\/8\" x 24 UNF Left Hand (1\" OD)","offer_id":57740560859511,"sku":"D22602L","price":56.11,"currency_code":"GBP","in_stock":true},{"title":"7\/16\" x 20 UNF Left Hand (1\" OD)","offer_id":57740560892279,"sku":"D22652L","price":56.11,"currency_code":"GBP","in_stock":true},{"title":"1\/2\" x 20 UNF Left Hand (1.5\/16\" OD)","offer_id":57740560925047,"sku":"D22703L","price":72.63,"currency_code":"GBP","in_stock":true},{"title":"9\/16\" x 18 UNF Left Hand (1.5\/16\" OD)","offer_id":57740560957815,"sku":"D22753L","price":72.63,"currency_code":"GBP","in_stock":true},{"title":"5\/8\" x 18 UNF Left Hand (1.1\/2\" OD)","offer_id":57740560990583,"sku":"D22804L","price":79.99,"currency_code":"GBP","in_stock":true},{"title":"3\/4\" x 16 UNF Left Hand (1.1\/2\" OD)","offer_id":57740561023351,"sku":"D22854L","price":79.99,"currency_code":"GBP","in_stock":true},{"title":"7\/8\" x 14 UNF Left Hand (2\" OD)","offer_id":57740561056119,"sku":"D22905L","price":128.81,"currency_code":"GBP","in_stock":true},{"title":"1\" x 12 UNF Left Hand (2\" OD)","offer_id":57740561088887,"sku":"D22955L","price":128.81,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0067\/9129\/9145\/files\/WisemanSplitDie_1e3d6cb7-6db1-4e70-a26f-cc79305d4ad6.png?v=1788643504"},{"product_id":"wiseman-hss-bsw-left-hand-split-dies-british-standard-whitworth-lh-thread","title":"Wiseman HSS BSW Left Hand Split Dies – British Standard Whitworth LH Thread","description":"\u003cp data-pm-slice=\"1 3 []\" style=\"text-align: center;\"\u003e\u003cspan\u003eWiseman HSS BSW Left Hand Split Dies are manufactured from High Speed Steel (HSS) and designed for cutting new external BSW (British Standard Whitworth) left-hand threads, as well as repairing, cleaning and restoring damaged or worn existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese round split dies feature an adjustable design, allowing minor adjustments to the thread fit when used with a suitable die stock. They are particularly useful for general engineering, machinery maintenance, restoration and specialist workshop applications requiring left-hand threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBSW threads feature a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e55° Whitworth thread profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e with rounded crests and roots. British Standard Whitworth is a traditional imperial thread system widely used in older British machinery, vintage vehicles, agricultural equipment and engineering assemblies.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eUnlike standard right-hand threads, \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eleft-hand BSW threads tighten anticlockwise and loosen clockwise\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. They are used in applications where the direction of rotation, mechanical movement or equipment design requires a reverse-threaded fastening.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese split dies are suitable for producing and restoring left-hand BSW threads on bolts, studs, rods, shafts and other externally threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHigh Speed Steel (HSS)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Durable construction for reliable thread cutting and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBSW Thread Form\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for British Standard Whitworth external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eLeft Hand Thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Tightens anticlockwise and loosens clockwise.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAdjustable Split Design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Allows minor adjustment of the thread fit when used with a suitable die stock.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRound Die Construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for use with compatible die stocks and die holders.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e55° Whitworth Thread Profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Features rounded crests and roots.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThread Cutting \u0026amp; Restoration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for cutting new external threads and repairing existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eReverse Thread Applications\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for components requiring left-hand threaded fastenings.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eEngineering \u0026amp; Restoration Use\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for general machining, machinery maintenance and vintage equipment restoration.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSuitable for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCutting new BSW left-hand external threads on rods, bolts and studs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRepairing damaged or worn BSW left-hand threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCleaning and restoring existing external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufacturing left-hand threaded shafts and fasteners.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eMaintenance of older British machinery and equipment.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eVintage and classic vehicle restoration.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAgricultural machinery repairs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRotating assemblies requiring reverse-threaded fastenings.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eGeneral engineering and workshop machining.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufacturing replacement left-hand threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eRecommended Use\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSelect the correct BSW left-hand split die diameter and threads per inch (TPI) to match the required external thread.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSecure the die in a compatible die stock or holder, ensuring the adjustment screws are correctly positioned. Prepare the workpiece to the appropriate diameter and apply a suitable chamfer to help the die start squarely.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eApply a suitable cutting lubricant and rotate the die \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eanticlockwise to cut the left-hand thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, viewed from the starting end of the workpiece. Periodically reverse the die clockwise slightly to help break and clear chips where appropriate for the material and cutting conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThe adjustable split design allows minor adjustments to the thread fit. For accurate results, check the finished thread using a suitable BSW left-hand thread gauge or correctly specified mating component.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eEnsure that the die is started squarely and that the correct cutting direction is maintained throughout the operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eImportant\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eSuitable for \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eBSW (British Standard Whitworth) left-hand external threads only\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eLeft-hand threads tighten anticlockwise and loosen clockwise.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eNot suitable for cutting standard right-hand BSW threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eFeatures a 55° Whitworth thread profile with rounded crests and roots.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eNot interchangeable with BSF, UNC, UNF, metric or other thread forms.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eAdjustable round split die for cutting and restoring external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eRequires a compatible die stock or die holder.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eEnsure the correct nominal diameter and TPI are selected before use.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Rennie Tool Company","offers":[{"title":"1\/4\" x 20 BSW Left Hand (13\/16\" OD)","offer_id":57740561121655,"sku":"D30301L","price":43.03,"currency_code":"GBP","in_stock":true},{"title":"5\/16\" x 18 BSW Left Hand (1\" OD)","offer_id":57740561154423,"sku":"D30402L","price":46.53,"currency_code":"GBP","in_stock":true},{"title":"3\/8\" x 16 BSW Left Hand (1\" OD)","offer_id":57740561187191,"sku":"D30452L","price":46.53,"currency_code":"GBP","in_stock":true},{"title":"1\/2\" x 12 BSW Left Hand (1.5\/16\" OD)","offer_id":57740561219959,"sku":"D30553L","price":59.66,"currency_code":"GBP","in_stock":true},{"title":"5\/8\" x 11 BSW Left Hand (1.1\/2\" OD)","offer_id":57740561252727,"sku":"D30654L","price":96.63,"currency_code":"GBP","in_stock":true},{"title":"1\" x 8 BSW Left Hand (2\" OD)","offer_id":57740561285495,"sku":"D30955L","price":128.81,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0067\/9129\/9145\/files\/WisemanSplitDie_1e3d6cb7-6db1-4e70-a26f-cc79305d4ad6.png?v=1788643504"},{"product_id":"wiseman-hss-bsf-left-hand-split-dies-british-standard-fine-lh-thread","title":"Wiseman HSS BSF Left Hand Split Dies – British Standard Fine LH Thread","description":"\u003cp data-pm-slice=\"1 3 []\" style=\"text-align: center;\"\u003e\u003cspan\u003eWiseman HSS BSF Left Hand Split Dies are manufactured from High Speed Steel (HSS) and designed for cutting new external BSF (British Standard Fine) left-hand threads, as well as repairing, cleaning and restoring damaged or worn existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese round split dies feature an adjustable design, allowing minor adjustments to the thread fit when used with a suitable die stock. They are particularly useful for general engineering, machinery maintenance, restoration and specialist workshop applications requiring fine-pitch left-hand threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBSF threads feature a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e55° Whitworth thread profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e with rounded crests and roots, but have a finer pitch than BSW (British Standard Whitworth) threads of the same nominal diameter. British Standard Fine threads are traditionally used in older British machinery, classic vehicles, motorcycles, agricultural equipment and engineering assemblies.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eUnlike standard right-hand threads, \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eleft-hand BSF threads tighten anticlockwise and loosen clockwise\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. They are used in applications where the direction of rotation, mechanical movement or equipment design requires a reverse-threaded fastening.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese split dies are suitable for producing and restoring left-hand BSF threads on bolts, studs, rods, shafts and other externally threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHigh Speed Steel (HSS)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Durable construction for reliable thread cutting and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBSF Thread Form\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for British Standard Fine external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eLeft Hand Thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Tightens anticlockwise and loosens clockwise.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAdjustable Split Design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Allows minor adjustment of the thread fit when used with a suitable die stock.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRound Die Construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for use with compatible die stocks and die holders.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e55° Whitworth Thread Profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Features rounded crests and roots with a finer pitch than BSW.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThread Cutting \u0026amp; Restoration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for cutting new external threads and repairing existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eReverse Thread Applications\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for components requiring left-hand threaded fastenings.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eEngineering \u0026amp; Restoration Use\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for general machining, machinery maintenance and vintage equipment restoration.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSuitable for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCutting new BSF left-hand external threads on rods, bolts and studs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRepairing damaged or worn BSF left-hand threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCleaning and restoring existing external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufacturing left-hand threaded shafts and fasteners.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eMaintenance of older British machinery and equipment.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eClassic car and vintage motorcycle restoration.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAgricultural machinery repairs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRotating assemblies requiring reverse-threaded fastenings.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eGeneral engineering and workshop machining.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufacturing replacement left-hand threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eRecommended Use\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSelect the correct BSF left-hand split die diameter and threads per inch (TPI) to match the required external thread.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSecure the die in a compatible die stock or holder, ensuring the adjustment screws are correctly positioned. Prepare the workpiece to the appropriate diameter and apply a suitable chamfer to help the die start squarely.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eApply a suitable cutting lubricant and rotate the die \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eanticlockwise to cut the left-hand thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, viewed from the starting end of the workpiece. Periodically reverse the die clockwise slightly to help break and clear chips where appropriate for the material and cutting conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThe adjustable split design allows minor adjustments to the thread fit. For accurate results, check the finished thread using a suitable BSF left-hand thread gauge or correctly specified mating component.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eEnsure that the die is started squarely and that the correct cutting direction is maintained throughout the operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eImportant\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eSuitable for \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eBSF (British Standard Fine) left-hand external threads only\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eLeft-hand threads tighten anticlockwise and loosen clockwise.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eNot suitable for cutting standard right-hand BSF threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eFeatures a 55° Whitworth thread profile with rounded crests and roots.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eNot interchangeable with BSW, UNC, UNF, metric or other thread forms.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eAdjustable round split die for cutting and restoring external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eRequires a compatible die stock or die holder.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eEnsure the correct nominal diameter and TPI are selected before use.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Rennie Tool Company","offers":[{"title":"1\/4\" x 26 BSF Left Hand (13\/16\" OD)","offer_id":57740561318263,"sku":"D32051L","price":45.3,"currency_code":"GBP","in_stock":true},{"title":"5\/16\" x 22 BSF Left Hand (1\" OD)","offer_id":57740561351031,"sku":"D32102L","price":49.45,"currency_code":"GBP","in_stock":true},{"title":"3\/8\" x 20 BSF Left Hand (1\" OD)","offer_id":57740561383799,"sku":"D32152L","price":49.45,"currency_code":"GBP","in_stock":true},{"title":"1\/2\" x 16 BSF Left Hand (1.5\/16\" OD)","offer_id":57740561416567,"sku":"D32253L","price":62.8,"currency_code":"GBP","in_stock":true},{"title":"7\/8\" x 11 BSF Left Hand (2\" OD)","offer_id":57740561449335,"sku":"D32555L","price":108.9,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0067\/9129\/9145\/files\/WisemanSplitDie_1e3d6cb7-6db1-4e70-a26f-cc79305d4ad6.png?v=1788643504"},{"product_id":"wiseman-hss-ba-left-hand-split-dies-british-association-lh-thread","title":"Wiseman HSS BA Left Hand Split Dies – British Association LH Thread","description":"\u003cp data-pm-slice=\"1 3 []\" style=\"text-align: center;\"\u003e\u003cspan\u003eWiseman HSS BA Left Hand Split Dies are manufactured from High Speed Steel (HSS) and designed for cutting new external BA (British Association) left-hand threads, as well as repairing, cleaning and restoring damaged or worn existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese round split dies feature an adjustable design, allowing minor adjustments to the thread fit when used with a suitable die stock. They are particularly useful for precision engineering, instrument making, model engineering, electrical equipment maintenance and specialist applications requiring small-diameter left-hand threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBritish Association threads feature a distinctive \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e47.5° thread profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e with rounded crests and roots. Unlike conventional metric or imperial thread series, BA threads are identified by numbered sizes, with larger BA numbers representing smaller thread diameters.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBA threads were traditionally used in electrical equipment, scientific instruments, model engineering, small machinery and precision mechanical assemblies. Left-hand BA threads are less common than their right-hand equivalents and are generally used in specialist applications requiring reverse-threaded fastenings.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eUnlike standard right-hand threads, \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eleft-hand BA threads tighten anticlockwise and loosen clockwise\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. These split dies are suitable for producing and restoring left-hand BA threads on screws, studs, rods and other externally threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHigh Speed Steel (HSS)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Durable construction for reliable thread cutting and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBA Thread Form\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for British Association external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eLeft Hand Thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Tightens anticlockwise and loosens clockwise.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAdjustable Split Design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Allows minor adjustment of the thread fit when used with a suitable die stock.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRound Die Construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for use with compatible die stocks and die holders.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e47.5° Thread Profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – British Association thread form with rounded crests and roots.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eNumbered Thread Sizes\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – BA sizes are designated by numbers rather than nominal inch diameters.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThread Cutting \u0026amp; Restoration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for cutting new external threads and repairing existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePrecision Engineering Applications\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Particularly useful for small threaded components and specialist restoration work.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSuitable for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCutting new BA left-hand external threads on screws, rods and studs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRepairing damaged or worn BA left-hand threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCleaning and restoring existing external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eModel engineering and miniature machinery.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eElectrical equipment and instrument repairs.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eScientific instrument manufacturing and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePrecision mechanical assemblies requiring reverse-threaded fastenings.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eVintage machinery and equipment restoration.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufacturing replacement left-hand threaded screws and specialist components.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eRecommended Use\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSelect the correct BA left-hand split die size to match the required external thread. Each BA size has its own specified major diameter and thread pitch.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSecure the die in a compatible die stock or holder, ensuring the adjustment screws are correctly positioned. Prepare the workpiece to the appropriate diameter and apply a suitable chamfer to help the die start squarely.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eApply a suitable cutting lubricant and rotate the die \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eanticlockwise to cut the left-hand thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, viewed from the starting end of the workpiece. Periodically reverse the die clockwise slightly to help break and clear chips where appropriate for the material and cutting conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThe adjustable split design allows minor adjustments to the thread fit. For accurate results, check the finished thread using a suitable BA left-hand thread gauge or correctly specified mating component.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eExtra care should be taken when cutting smaller BA thread sizes due to the reduced diameter and increased risk of damaging delicate workpieces.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eImportant\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eSuitable for \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eBA (British Association) left-hand external threads only\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eLeft-hand threads tighten anticlockwise and loosen clockwise.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eNot suitable for cutting standard right-hand BA threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eFeatures a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e47.5° thread profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e with rounded crests and roots.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eBA thread sizes are numbered, with higher numbers representing smaller nominal diameters.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eNot interchangeable with metric, BSW, BSF, UNC, UNF or other thread forms.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eAdjustable round split die for cutting and restoring external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eRequires a compatible die stock or die holder.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eEnsure the correct BA size is selected before use.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Rennie Tool Company","offers":[{"title":"4 BA Left Hand (13\/16\" OD)","offer_id":57740561547639,"sku":"D35401L","price":44.68,"currency_code":"GBP","in_stock":true},{"title":"2 BA Left Hand (13\/16\" OD)","offer_id":57740561580407,"sku":"D35501L","price":44.68,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0067\/9129\/9145\/files\/WisemanSplitDie_1e3d6cb7-6db1-4e70-a26f-cc79305d4ad6.png?v=1788643504"},{"product_id":"wiseman-hss-bsp-left-hand-split-dies-british-standard-pipe-parallel-lh-thread","title":"Wiseman HSS BSP Left Hand Split Dies – British Standard Pipe Parallel LH Thread","description":"\u003cp data-pm-slice=\"1 3 []\" style=\"text-align: center;\"\u003e\u003cspan\u003eWiseman HSS BSP Left Hand Split Dies are manufactured from High Speed Steel (HSS) and designed for cutting new external BSP (British Standard Pipe) parallel left-hand threads, as well as repairing, cleaning and restoring damaged or worn existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese round split dies feature an adjustable design, allowing minor adjustments to the thread fit when used with a suitable die stock. They are particularly useful for specialist engineering, machinery maintenance, pipe fitting and workshop applications requiring left-hand threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBSP parallel threads, also known as BSPP or G threads, feature a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e55° Whitworth thread profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e with rounded crests and roots. Unlike BSPT (British Standard Pipe Taper) threads, BSP parallel threads maintain a constant diameter along the threaded section.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eUnlike standard right-hand threads, \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eleft-hand BSP threads tighten anticlockwise and loosen clockwise\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. These reverse-threaded connections are used in specialist equipment and mechanical assemblies where left-hand threads are required by the original design.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBSP parallel threads are commonly used in hydraulic, pneumatic and industrial fittings. Where a pressure-tight connection is required, sealing is normally achieved using a suitable washer, O-ring, gasket or other sealing arrangement rather than the parallel threads themselves.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThese split dies are suitable for producing and restoring left-hand BSP parallel external threads on compatible pipes, fittings, adapters and other threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHigh Speed Steel (HSS)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Durable construction for reliable thread cutting and maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBSP Parallel Thread Form\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for British Standard Pipe Parallel external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eLeft Hand Thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Tightens anticlockwise and loosens clockwise.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAdjustable Split Design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Allows minor adjustment of the thread fit when used with a suitable die stock.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRound Die Construction\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Designed for use with compatible die stocks and die holders.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e55° Whitworth Thread Profile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Features rounded crests and roots.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eParallel Thread Design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Produces threads with a constant nominal major diameter along their length.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThread Cutting \u0026amp; Restoration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for cutting new external threads and repairing existing threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSpecialist Engineering Applications\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e – Suitable for equipment requiring left-hand BSP parallel threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSuitable for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\" style=\"text-align: center;\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCutting new BSP parallel left-hand external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRepairing damaged or worn BSP left-hand threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCleaning and restoring existing external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufacturing specialist left-hand threaded pipe fittings.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eHydraulic fittings and adapters requiring BSP LH threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePneumatic equipment and industrial machinery.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eMechanical assemblies requiring reverse-threaded connections.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eGeneral engineering and workshop machining.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eManufacturing replacement left-hand threaded components.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eRecommended Use\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSelect the correct BSP left-hand split die size and threads per inch (TPI) to match the required external thread.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eBSP sizes are designated by nominal pipe sizes rather than the actual outside diameter of the thread. For example, a 1\/2\" BSP thread has an external major diameter of approximately 20.96mm, not 12.7mm.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eSecure the die in a compatible die stock or holder, ensuring the adjustment screws are correctly positioned. Prepare the workpiece to the appropriate diameter and apply a suitable chamfer to help the die start squarely.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eApply a suitable cutting lubricant and rotate the die \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eanticlockwise to cut the left-hand thread\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, viewed from the starting end of the workpiece. Periodically reverse the die clockwise slightly to help break and clear chips where appropriate for the material and cutting conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eThe adjustable split design allows minor adjustments to the thread fit. Check the finished thread using a suitable BSP parallel left-hand thread gauge or correctly specified mating component.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eWhere the threaded connection is required to seal against pressure, ensure that the appropriate sealing method is used and that the complete connection is suitable for the intended application.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003e\u003cspan\u003eImportant\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eSuitable for \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eBSP (British Standard Pipe Parallel) left-hand external threads only\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eLeft-hand threads tighten anticlockwise and loosen clockwise.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eNot suitable for cutting standard right-hand BSP threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eFeatures a 55° Whitworth thread profile.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eProduces parallel threads, not tapered threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eNot interchangeable with BSPT or NPT dies.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eBSP nominal thread sizes do not correspond directly to the measured external thread diameter.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eBSP parallel threads generally require a separate sealing arrangement where a pressure-tight connection is needed.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli style=\"text-align: center;\"\u003e\n\u003cp\u003e\u003cspan\u003eAdjustable round split die for cutting and restoring external threads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003eRequires a compatible die stock or die holder.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Rennie Tool Company","offers":[{"title":"1\/8\" x 28 BSP Left Hand (1\" OD)","offer_id":57740561613175,"sku":"D50551L","price":79.19,"currency_code":"GBP","in_stock":true},{"title":"1\/4\" x 19 BSP Left Hand (1.5\/16\" OD)","offer_id":57740561645943,"sku":"D50602L","price":87.86,"currency_code":"GBP","in_stock":true},{"title":"3\/8\" x 19 BSP Left Hand (1.1\/2\" OD)","offer_id":57740561678711,"sku":"D50653L","price":121.39,"currency_code":"GBP","in_stock":true},{"title":"1\/2\" x 14 BSP Left Hand (1.1\/2\" OD)","offer_id":57740561711479,"sku":"D50703L","price":121.39,"currency_code":"GBP","in_stock":true},{"title":"5\/8\" x 14 BSP Left Hand (2\" OD)","offer_id":57740561744247,"sku":"D50755L","price":145.45,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0067\/9129\/9145\/files\/WisemanSplitDie_1e3d6cb7-6db1-4e70-a26f-cc79305d4ad6.png?v=1788643504"}],"url":"https:\/\/www.rennietool.co.uk\/collections\/hss-split-dies-metric-imperial-left-hand-thread-cutting-dies.oembed","provider":"Rennie Tool Company","version":"1.0","type":"link"}