Wiseman HSS BSP Hexagon Die Nuts – British Standard Pipe Parallel Right Hand Thread

Wiseman HSS BSP Hexagon Die Nuts are manufactured from High Speed Steel (HSS) and designed for repairing, cleaning and restoring damaged or worn external BSP (British Standard Pipe Parallel) 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.

BSP parallel threads, also known as BSPP or G threads, feature a 55° Whitworth thread profile with rounded crests and roots. Unlike BSPT threads, which feature a tapered thread, BSP parallel threads maintain a constant diameter along their length. They are widely used in pipe fittings, hydraulic systems, pneumatic equipment and industrial machinery.

Manufactured with a right-hand thread profile, these die nuts are suitable for restoring existing BSP parallel threads on pipes, fittings and other externally threaded components.

Key Features

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

• BSP Parallel Thread Form – Designed for British Standard Pipe Parallel 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 pipe threads.

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

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

• Parallel Pipe Thread – Constant thread diameter along its length, unlike tapered BSPT threads.

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

Applications

Suitable for:

• Repairing damaged BSP parallel threads on pipes and fittings.

• Cleaning existing external parallel pipe threads.

• Restoring worn or contaminated threads.

• General engineering and workshop maintenance.

• Compressed air and pneumatic equipment.

• Hydraulic and fluid transfer equipment using BSP parallel connections.

• Industrial machinery and pipework maintenance.

• Maintenance of threaded adapters, connectors and pipe fittings.

Recommended Use

Select the correct BSP 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 pipe or bar stock.

After thread restoration, inspect the thread for damage and verify the connection using the appropriate BSP thread gauge and assembly requirements.

Important

• Suitable for BSP (British Standard Pipe Parallel) right-hand external threads only.

• Not suitable for cutting or restoring tapered BSPT threads.

• Not compatible with NPT, NPS or metric pipe threads.

• BSP parallel threads feature a 55° Whitworth profile with a constant thread diameter.

• Non-adjustable hexagon die nut.

• BSP nominal pipe sizes do not correspond directly to the outside diameter of the thread.

• Ensure the correct nominal pipe size and threads per inch (TPI) are selected before use.