The M20 x 2.0mm HSS Split Die Fine (1 1/2") is a round, adjustable cutting die for producing or restoring external M20 fine-pitch metric threads (20mm diameter, 2.0mm pitch). It is intended for use in a compatible round die stock and is primarily used to cut or repair threads on shafts, studs and rods where an ISO metric fine thread form is required.

This die is manufactured from high speed steel (HSS, typically M2 grade) and is heat-treated then ground to produce an accurate thread profile. The tool has a split-body configuration with an adjustment screw that permits slight size alteration and controlled thread fit, allowing users to open the split for a looser fit or close it for a tighter tolerance. The finish is a ground, bright/ polished surface to aid chip flow and ensure consistent thread geometry. The thread form conforms to ISO metric thread dimensions (ISO 261/965) and is compatible with BS 3643; the product design follows round split die profile conventions (DIN 223) for hand dies.

Typical applications include on-site repair of damaged external threads, cutting new threads on turned bar or studs, and finishing threads where fine pitch is specified. Industries that commonly use this die include engineering workshops, plant maintenance, heavy fabrication, automotive service, rail and marine maintenance, and general industrial assembly. For best results use with an appropriate cutting oil and a matched die stock; the split design also facilitates thread-cleaning and minor re-sizing without full re-machining.

Key benefits of this HSS split die are wear resistance and edge retention from the HSS material, the ability to adjust thread fit via the split body and screw, and full compatibility with ISO metric M20 x 2.0 thread standards. While HSS itself offers good cutting life, corrosion resistance is limited compared with stainless options, so storage and use with suitable lubricants is advised.

Duchy Fasteners stocks a wide range of split and solid metric dies from small to large diameters. The M20 x 2.0mm split die is available as a single item and we supply related die stocks, spare adjustment screws and multi-size sets; contact us for specific pack sizes and availability.