Wiseman HSS UNF Left Hand Hexagon Die Nuts – Unified Fine Thread

Wiseman HSS UNF Left Hand Hexagon Die Nuts are manufactured from High Speed Steel (HSS) and designed for repairing, cleaning and restoring damaged or worn external UNF (Unified National Fine) left-hand threads.

These precision-engineered hexagon die nuts feature a fixed, non-adjustable design and can be operated using a suitable spanner or socket, making them particularly useful for maintenance, repair and specialist engineering applications.

UNF threads feature a 60° thread profile and a finer pitch than UNC (Unified National Coarse) threads of the same nominal diameter. Left-hand threads tighten in an anticlockwise direction and are commonly used in applications where rotational forces, vibration or specific mechanical requirements make a reverse thread direction necessary.

Manufactured with a left-hand thread profile, these die nuts are suitable for restoring existing UNF left-hand threads on bolts, studs, shafts and other externally threaded components.

Key Features

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

• UNF Thread Form – Designed for Unified National Fine external threads.

• Left Hand Thread – Reverse thread direction, tightening anticlockwise.

• Hexagon Design – Can be operated using a suitable spanner or socket.

• Thread Repair & Restoration – Ideal for cleaning, chasing and restoring damaged or worn external threads.

• Fixed Die Nut – Non-adjustable design for consistent thread engagement.

• 60° Thread Profile – Unified thread form with a finer pitch than UNC threads of the same diameter.

• Uncoated Finish – Traditional HSS construction without additional surface coating.

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

Applications

Suitable for:

• Repairing damaged UNF left-hand threads on bolts and studs.

• Cleaning existing left-hand external threads.

• Restoring worn or contaminated threads.

• General engineering and workshop maintenance.

• Automotive and machinery repairs.

• Maintenance of rotating shafts and specialist mechanical assemblies.

• Applications requiring left-hand Unified Fine threaded components.

Recommended Use

Select the correct UNF left-hand thread size and pitch to match the existing external thread.

Position the die nut squarely onto the thread and rotate anticlockwise to advance it along a conventional left-hand external thread. Apply an appropriate cutting lubricant where required and avoid excessive force.

Hexagon die nuts are primarily intended for thread cleaning, chasing and restoration rather than cutting new threads from plain bar stock.

Important

• Suitable for UNF (Unified National Fine) left-hand external threads only.

• Not suitable for standard right-hand UNF threads.

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

• Non-adjustable hexagon die nut.

• Ensure the correct thread diameter, threads per inch (TPI) and left-hand direction are selected before use.