The Ø 25 x 9 HSS-G circular dies for metric threads are designed for producing external ISO threads according to DIN 13 on rods, pins, studs, special screws and mechanical components that need to be manufactured, reworked or repaired. The HSS-G high-speed steel construction provides good wear resistance, stable thread profile and accurate thread formation, making these dies suitable for manual workshop operations, maintenance work, toolrooms, industrial repairs and general mechanical applications.

The 60° thread profile, 6g tolerance and closed pre-slotted Form B geometry allow regular and controlled external metric threads to be produced. The closed Form B design provides good guidance when the die starts cutting on the workpiece, while the pre-slotted construction helps distribute cutting forces and supports stable thread formation. The standard Ø= 25 mm diameter with 9 mm height makes these dies compatible with die stocks and holders designed for this size, offering a compact and practical solution for commonly used metric thread dimensions.

To obtain accurate threads, the external workpiece diameter must be prepared correctly, a suitable starting chamfer must be made, the die must be kept coaxial and perpendicular to the component axis, and suitable cutting lubricant must be used. Incorrect workpiece diameter, misaligned starting or insufficient lubrication can cause incomplete threads, torn thread profiles, increased cutting effort, premature tool wear and difficult feeding. During machining, progressive cutting with periodic chip breaking is recommended, especially on tougher materials or when repairing damaged threads.

These dies are suitable for mechanical workshops, maintenance technicians, production departments, toolrooms, automotive work, mechanical engineering and thread repair on metallic components. They allow external metric threads to be produced or restored with good dimensional control, regular thread profile and reliable operation, offering a versatile solution for technical work and manual threading on ISO metric threads.