This product is an M8 × 1.0 fine-pitch external split die made from high speed steel (HSS), intended for cutting or repairing M8 threads with a 1.0 mm pitch on round bars, rods and shafts. The split design allows the die to be slightly adjusted in the die holder to produce a closer or freer fit, making it ideal for finishing or restoring threads where control over fit is required.

The die is manufactured from M2 grade high-speed steel, hardened and tempered and supplied with a precision-ground finish for crisp thread form. It cuts ISO metric threads to the ISO metric thread form (ISO 68‑1) and is produced to general ISO/DIN/BS dimensional practice for metric external dies. The thread type is external (M8 × 1.0 fine), the tool is a round split die with an axial split and clamping screw groove so it is used in a standard split-die holder rather than having a head or drive feature of its own.

Typical applications include maintenance and repair work on machinery, fabrication of precision assemblies in automotive and instrumentation, and engineering workshops where fine pitch is required for better clamping and vibration resistance. The die performs well on mild steel, alloy steels, brass, bronze and aluminium; stainless steels should be cut with slower speeds and appropriate lubricant. It is commonly used in mechanical engineering, plant maintenance, motor vehicle repair and prototyping.

Key benefits are the wear resistance and edge retention of M2 HSS, which sustains cutting performance over longer runs than carbon tool steel dies, and the split feature which allows slight size adjustment to achieve the correct thread clearance. While HSS itself offers limited corrosion resistance, dies may be supplied with a protective black-oxide finish or used with corrosion-inhibiting lubricants to improve durability in humid environments. The die is compatible with standard split-die holders and works alongside standard taps for matched internal/external thread assemblies.

Duchy Fasteners stocks this M8 × 1 split die across common sizes and in single and multi-pack options; complementary die holders and cutting oils are also available to complete the threading set.