This product is a right‑hand NO.8 UNF split die intended for cutting, restoring or cleaning No.8 UNF threads (8‑36 TPI) on rods and bolts. The die body is nominally produced to fit a 13/16" die stock, making it suitable for use in standard hand die holders as well as compatible machine die fixtures for light production or maintenance work.

The die is manufactured from M2 high speed steel (HSS) and supplied with a protective dark finish (black oxide/oil) to resist surface corrosion during storage and use. The thread form is the Unified 60° profile to UNF specification and the size is No.8 UNF (8‑36 threads per inch), right‑hand. The split design incorporates an axial slot and adjustment screw so the effective diameter can be opened or closed slightly to compensate for die wear or to produce a cleaner running fit on worn male threads. Threads conform to common UN/UNF dimensional practice (ASME/ANSI B1.1 compatible) and are produced to normal workshop tolerances for hand and light machine use.

Typical applications include maintenance and repair in automotive, motorsport, engineering and fabrication shops where imperial UNF fastenings are still used, instrumentation and electrical assemblies requiring fine threads, and general workshop refurbishment where restoring damaged threads is required. The compact No.8 size is commonly found on small brackets, bodywork fittings, switches and panel fastenings.

Key benefits of this M2 HSS split die are its wear‑resistant material for extended tool life, the adjustability provided by the split form for fine fit control, and the protective finish that reduces seizing and corrosion during intermittent use. Compatibility with standard 13/16" die stocks and conformity to UNF thread form makes it a straightforward replacement for workshop dies.

Duchy Fasteners carries a broad range of hand and machine taps and dies across imperial and metric sizes. The split dies are available in single pieces and multi‑pack options; contact us for current stock sizes, TPI variants and pack quantities.