This product is a 3/8" BSPF (2" O/D) right‑hand split die manufactured from high speed steel (HSS, typically M2 grade) for cutting or repairing external British Standard Pipe Fine threads. It is intended for use with a compatible die stock or in suitable machine holders to form 3/8" BSPF external threads on cylindrical components, allowing easy on‑site thread manufacture and maintenance.

The die is the split (adjustable) type, with a 2‑inch outer diameter suitable for standard die stocks. The cutting form matches the BSPF thread profile commonly used in UK pipework and fittings and is compatible with ISO 228‑1 (parallel pipe threads) and established BS pipe thread practice where BSP parallel fittings are specified. The 3/8" BSPF size is a fine‑pitch parallel thread (commonly 19 tpi), right‑hand cut. The HSS material provides a hardened cutting edge; the die is supplied with a protective finish (black oxide/clear lacquer depending on batch) to resist surface corrosion in storage and to aid chip evacuation during cutting.

Typical applications include plumbing and hydraulic installation, repair of fittings and connectors, instrumentation and process piping, agricultural hydraulics and general workshop maintenance. The split design allows small adjustments to thread fit and makes it straightforward to clean or reopen damaged threads, which is valuable in service and repair environments where component replacement would be costly.

Key benefits of this HSS split die include the wear resistance and hot‑hardness of M2 HSS for reliable cutting life across steels, stainless steels, brass and aluminium when used with appropriate cutting lubricant, the adjustability of the split die for achieving a good fit, and dimensional compatibility with standard BSP parallel fittings. While HSS is not stainless, the protective finish reduces corrosion risk during storage and handling.

Duchy Fasteners stocks this 3/8" BSPF HSS split die across a range of sizes and pack options; please contact us for availability of other BSPF/BSP sizes, die holders and accessory sets. Part code: DIEPF00372.