{"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","url":"https:\/\/www.rennietool.co.uk\/products\/wiseman-hss-unc-left-hand-split-dies-unified-national-coarse-thread","provider":"Rennie Tool Company","version":"1.0","type":"link"}