These GB118 precision internal thread taper pins are professional high-strength positioning fasteners, available in high-quality 45# carbon steel and 40Cr alloy steel for excellent mechanical strength and wear resistance. After professional heat treatment with hardness controlled at HRC38°-46°, these tapered dowel pins feature stable hardness, high toughness and long service life, suitable for heavy-duty mechanical positioning and industrial equipment assembly. Fully compliant with GB118 national standard specifications, these internal thread taper pins adopt strict dimensional tolerance control and standard taper design, ensuring precise positioning, tight fitting and non-loose connection under heavy load and vibration. The internal thread structure enables convenient installation, disassembly and secondary fixing, effectively improving assembly efficiency and positioning stability in mechanical matching. Widely applied in mold assembly, mechanical equipment positioning, engineering machinery connection, fixture fixing and transmission device locking projects, these heat-treated taper pins cover complete sizes M6, M8, M10 to M20 to meet various heavy-duty positioning demands. Each GB118 internal thread tapered pin undergoes strict hardness and dimensional inspection, ensuring consistent precision and reliable working performance. Factory-direct supply with full specification stock available, these high-precision taper pins are the top choice for global machinery manufacturers, mold factories and industrial buyers, providing cost-effective high-strength positioning solutions for mechanical and industrial application scenarios.