This is a 12 mm x 1.5 HSS die nut for cutting and restoring external metric fine threads (M12 × 1.5). It is designed to form or chase external threads on rods, bolts and studs where a fine pitch is required for greater adjustment resolution or where a coarse thread would not provide sufficient engagement. The die nut is intended for use in a hand die stock and is also compatible with light-duty machine holders where the toolholder accepts standard die nuts.

The die nut is manufactured from M2 high speed steel (HSS, DIN 1.3343) and is heat-treated to provide the hardness and wear resistance expected of cutting tools. The working faces are ground to the ISO metric thread profile for M12 × 1.5 and the item is supplied with a bright/ground finish; some variants are offered with a protective black oxide — please check product code DIEN1215 for the specific finish. The thread type is external metric fine, produced to the ISO metric thread form; it is compatible with ISO 261/965 thread series and follows the standard profile dimensions used in DIN/ISO metric systems.

Externally the die nut features flats to accept a standard die stock or spanner for secure, controlled cutting and adjustment. No special drive is required beyond the matching die holder. The cut geometry of the HSS delivers consistent thread form on common engineering materials including mild and medium carbon steels, brass, aluminium and some stainless steels when used with appropriate cutting lubricant and correct technique.

Typical applications include general engineering maintenance, plant and machinery repair, automotive and agricultural repairs, fabrication workshops and any setting where thread repair or bespoke thread cutting is required. Key benefits are the durability and edge retention of M2 HSS, accurate ISO-compatible thread form for interchangeability with standard fasteners, and suitability for repeated re-sharpening. Corrosion resistance is limited for uncoated HSS; light oiling after use and storage in a dry environment are recommended to prevent rust.

Duchy Fasteners stocks metric HSS die nuts across the common range and supplies the 12 mm × 1.5 die (DIEN1215) as single items or in workshop packs — contact us for available sizes and pack options.