Wiseman HSS BSW Hexagon Die Nuts – British Standard Whitworth Right Hand Thread

Wiseman HSS BSW Hexagon Die Nuts are manufactured from High Speed Steel (HSS) and designed for repairing, cleaning and restoring damaged or worn external BSW (British Standard Whitworth) 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 general engineering applications.

BSW threads feature a 55° thread angle with rounded crests and roots, distinguishing them from the 60° thread profile used by Unified thread forms. British Standard Whitworth threads are commonly found on older British machinery, vintage vehicles, agricultural equipment and traditional engineering components.

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

Key Features

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

• BSW Thread Form – Designed for British Standard Whitworth external threads.

• Right Hand Thread – Standard clockwise tightening thread direction.

• 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.

• 55° Thread Profile – Whitworth thread form featuring rounded crests and roots.

• 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 BSW threads on bolts and studs.

• Cleaning existing external Whitworth threads.

• Restoring worn or contaminated threads.

• General engineering and workshop maintenance.

• Vintage and classic vehicle restoration.

• Maintenance of older British machinery and equipment.

• Agricultural machinery repairs.

• Restoration of traditional engineering components using BSW fasteners.

Recommended Use

Select the correct BSW thread size and pitch to match the existing external thread.

Position the die nut squarely onto the thread and rotate using a suitable spanner or socket. 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 BSW (British Standard Whitworth) right-hand external threads only.

• Not compatible with BSF, UNC, UNF, metric or other thread forms unless the exact thread specifications match.

• Non-adjustable hexagon die nut.

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