Wiseman HSS UNF Split Dies – Unified Fine Right Hand Thread

Wiseman 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.

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 general engineering, thread cutting, maintenance and workshop applications.

UNF 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.

Manufactured 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.

Key Features

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

• UNF Thread Form – Designed for Unified National Fine 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 a fine thread pitch.

• Versatile Applications – Suitable for general engineering, automotive and maintenance work.

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

Applications

Suitable for:

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

• Repairing damaged or worn UNF threads.

• Cleaning and restoring existing external threads.

• General engineering and workshop machining.

• Automotive and machinery repairs.

• Fabrication and maintenance of threaded components.

• Manufacturing replacement bolts and studs.

• Applications requiring Unified National Fine threads.

Recommended Use

Select the correct UNF 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 UNF (Unified National Fine) right-hand external threads only.

• Not compatible with UNC, UNEF, metric or other thread forms.

• 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.