Wiseman HSS UNS Split Dies – Unified Special Right Hand Thread

Wiseman 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.

These 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.

UNS 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.

Manufactured 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.

Key Features

• High Speed Steel (HSS) – Durable construction for reliable thread cutting and maintenance.

• UNS Thread Form – Designed for Unified National Special external threads.

• Right Hand Thread – Standard clockwise tightening thread direction.

• Adjustable Split Design – Allows minor adjustment of the thread fit when used with a suitable die stock.

• Round Die Construction – Designed for use with compatible die stocks and die holders.

• Thread Cutting & Restoration – Suitable for cutting new external threads and repairing existing threads.

• 60° Thread Profile – Unified thread form featuring special diameter and pitch combinations.

• Special Thread Sizes – Suitable for applications requiring non-standard Unified thread dimensions.

• Professional Quality – Manufactured by Wiseman Threading Tools for specialist engineering and workshop applications.

Applications

Suitable for:

• Cutting new UNS external threads on rods, bolts and studs.

• Repairing damaged or worn UNS threads.

• Cleaning and restoring existing external threads.

• Precision engineering and specialist workshop machining.

• Automotive and machinery repairs.

• Fabrication and maintenance of specialist threaded components.

• Manufacturing replacement bolts and studs.

• Applications requiring Unified National Special thread sizes.

Recommended Use

Select the correct UNS split die size and pitch to match the required external thread.

Secure 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.

Apply 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.

The 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.

Important

• Suitable for UNS (Unified National Special) right-hand external threads only.

• Not interchangeable with UNC, UNF, UNEF, UNJF or metric thread forms unless the exact thread specifications match.

• Adjustable round split die for cutting and restoring external threads.

• Requires a compatible die stock or die holder.

• Ensure the correct thread diameter and threads per inch (TPI) are selected before use.