These GB117 standard precision taper pins are professional high-precision positioning fasteners for industrial assembly. Manufactured from premium 45# medium carbon steel and high-strength 40Cr alloy steel, they undergo rigorous heat treatment to ensure high hardness, wear resistance and excellent mechanical stability. With standard taper design and strict dimensional tolerance control, the dowel pins deliver accurate positioning, firm locking and easy installation. Full size range covers Φ1, Φ2, Φ3, Φ4, Φ5 up to Φ20 to meet various matching requirements. Widely used in machinery equipment, mold assembly, automotive manufacturing and precision instrument positioning. Stable quality and high cost performance, ideal for engineering manufacturers and hardware procurement clients worldwide.