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The IRWIN IR6640 is a hexagonal threading die designed to cut external threads on round stock, bolts, and fasteners. Built from hardened carbon steel (HCS), this die produces clean 10mm x 1.5mm metric threads in a single pass or in multiple cleanup passes on damaged threads. The 1-inch hex body seats securely in a standard die stock or tap-and-die wrench, giving the technician consistent torque transfer during thread cutting. It is sold individually and is a practical addition to any metric threading set used in heavy shop work or field repair.
This die is suited for automotive repair and general machinery maintenance where metric external threads are required. It handles thread restoration on studs, rod ends, and machine screws in the M10 x 1.5 standard pitch — one of the most common metric thread sizes found across engine components, suspension hardware, and industrial equipment. Professionals working in automotive, diesel, or manufacturing maintenance will find this a frequently reached-for tool.
Designed for use with standard 1-inch hex die stocks; compatible with automotive and machinery fasteners requiring M10 x 1.5mm external threading.
Thread cutting dies are typically used by machinists, mechanics, and maintenance technicians. Secure the die firmly in a correctly sized die stock before use, and apply a suitable cutting oil to the workpiece to reduce friction and extend die life. Ensure the workpiece stock diameter is within the specified tolerance for M10 threads before cutting. Inspect the die for wear or chipping before each use to avoid producing out-of-tolerance threads.
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