Wiseman HSS BA Hexagon Die Nuts – British Association Right Hand Thread

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

BA threads feature a distinctive 47.5° thread angle with rounded crests and roots. The British Association thread system was developed for small-diameter precision fasteners and is commonly found in electrical equipment, instrumentation, model engineering, clocks and older British machinery.

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

Key Features

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

• BA Thread Form – Designed for British Association 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.

• 47.5° Thread Profile – British Association thread form featuring rounded crests and roots.

• Precision Thread Sizes – Suitable for smaller-diameter threaded components and specialist engineering applications.

• 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 BA threads on screws and studs.

• Cleaning existing external British Association threads.

• Restoring worn or contaminated threads.

• Precision engineering and workshop maintenance.

• Model engineering and miniature machinery.

• Electrical equipment and instrumentation repairs.

• Clockmaking and restoration of mechanical instruments.

• Maintenance of older British equipment using BA fasteners.

Recommended Use

Select the correct BA thread size 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.

Take particular care when working with smaller BA thread sizes, as excessive force or misalignment may damage delicate threaded components.

Important

• Suitable for BA (British Association) right-hand external threads only.

• Not compatible with metric, BSW, BSF, UNC, UNF or other thread forms.

• Non-adjustable hexagon die nut.

• Ensure the correct BA thread size is selected before use.