This is a 16 mm x 1 mm HSS split die designed for cutting external M16 × 1 metric fine threads by hand or in suitable die-holders on light machines. Its primary use is to restore damaged threads or to cut precise external fine threads on bar, rod and tubular components where the 1 mm pitch is required instead of the coarser M16 × 2 series.

The die is manufactured from M2 high speed steel (HSS), precision ground to a true thread form and supplied as a split (adjustable) round die to allow for minor size correction and improved chip clearance. It produces ISO metric fine thread form compliant with ISO thread geometry (ISO 68-1) and is compatible with ISO/BS metric thread series (ISO 261 / BS 3643). The product is presented in the common round die format to fit standard die stocks and holders; the split feature is secured and adjusted by the set screw on the die body.

M2 HSS gives the die good red hardness and wear resistance compared with carbon steels, making it suitable for cutting mild steel, alloy steels, free-cutting steels, brass, copper and aluminium. The precision ground finish ensures accurate mating with standard nuts and tapped holes. For improved corrosion resistance a black oxide finish is often applied to HSS dies; please check the specific product listing for finish details.

Typical applications include maintenance and repair workshops, automotive thread repair, plant and machinery refurbishment, fabrication and mechanical engineering where fine-pitch M16 thread is required. The split design helps when cutting in poor access or when slight size adjustment is necessary to achieve a correct fit with existing components.

Key benefits are the strength and hot hardness of M2 HSS for extended tool life, the ability to adjust the cut via the split to control thread fit, and compatibility with ISO/BS metric thread standards for interchangeability. Duchy Fasteners stocks this M16 × 1 HSS split die alongside a broad range of metric HSS split dies in common sizes, available singly or in sets; please refer to our catalogue for available sizes and pack options.