What this tool does and why you need it A heat-treated carbon steel hex die designed to cut, correct, or clean external NPT pipe threads. It restores damaged threads and produces precise, strong threads for reliable pipe and fitting connections. Key benefits Durable construction: made from carbon steel and heat treated to approximately 56–62 HRC for high wear resistance, good toughness, and temper stability. Accurate NPT thread form: machined for the standard NPT taper with 60° teeth to produce clear, flat threads suitable for most thread-cutting tasks. Easy and secure handling: hexagonal shape fits most wrenches and machine tools for straightforward manual or powered use. Unclogging design: multiple chip-removal slots help evacuate metal chips and reduce clogging so jobs finish faster and cleaner. Wide material compatibility: suitable for general thread cutting on stainless steel, aluminium alloy, cast iron, copper, iron, aluminum, plastic, and similar materials. Main features Material: carbon steel, heat treated Hardness: approx. 56–62 HRC Thread standard: NPT taper, 60° tooth profile Shape: hexagonal die for wrench/machine compatibility Design: multiple chip removal slots for efficient cutting and chip clearance Functions: machining, correcting, or cleaning external threads Typical applications / use scenarios 1. Maintenance and repair of plumbing lines: re-cut or clean damaged NPT threads on gas or water pipes to restore a leak-free connection. 2. Equipment and machine servicing: correct worn threads on pump housings, flanges, or fittings made of cast iron, aluminum alloy, or steel. 3. Fabrication and retrofit work: produce or restore external NPT threads on metal or plastic components during assembly or field repairs. Practical notes Designed for general-purpose thread cutting and repair tasks where durable, accurate NPT external threads are required. Hex shape and standard NPT specifications make the die compatible with common wrenches and machine tool setups. This hexagonal NPT die combines hardened carbon steel construction, standard NPT form, and chip-clearance features to deliver reliable thread cutting, correction, and cleaning across a wide range of materials and maintenance scenarios.