This 12 mm x 1.75 HSS dienut is a one-piece external thread cutting die designed to restore or form M12 x 1.75 ISO metric coarse threads on bars, studs and shafts. Its primary use is cutting external threads by hand in a die stock or by light machine work where a compact, robust die is required for on-site repairs, fabrication or small-batch production.

Manufactured from M2 high speed steel (HSS) and supplied with a black oxide finish, the dienut offers improved wear resistance and easier chip evacuation compared with plain carbon steel dies. The thread form conforms to ISO metric thread geometry (ISO 261 / ISO 965) and is compatible with BS 3643 dimensional practice, making it suitable for producing threads that meet common engineering tolerances. As a solid round die (dienut) it is not an adjustable split die; it is intended for clean, controlled passes with suitable cutting lubricant.

Typical applications include maintenance and repair in automotive and agricultural machinery, general engineering and fabrication, metalworking workshops and plant maintenance where replacing or repairing external threads on studs, threaded rod and bolts is required. The M2 HSS construction allows cutting and reforming of mild and alloy steels and, with correct lubrication and technique, can be used on stainless steels, brass and aluminium. The die is intended for use in a standard die stock or holder and is compatible with common workshop tooling.

Key benefits of this HSS dienut are durable edge retention under repeated use, resistance to premature wear from higher cutting temperatures than carbon steel dies, and dimensional compatibility with ISO/BS metric thread systems. The black oxide finish gives some added protection against corrosion and reduces light reflection during use; for optimal life, use appropriate cutting fluid and store dry.

Duchy Fasteners stocks a wide range of metric dies and dienuts across standard sizes; this M12 x 1.75 item is available to purchase individually or in small multi-packs for workshop convenience. If you require other metric sizes or matching die stocks, please contact Duchy Fasteners for availability.