Komatsu 205-70-72130 Bushing

The 205-70-72130 bushing is a critical flanged wear component engineered for the high-load, high-friction pivot areas of Komatsu hydraulic excavators. It serves as the arm end to bucket bushing (dipper to bucket connection) in the work equipment linkage system. Manufactured from alloy steels including 40Cr, 45#, and 20CrMnTi, the component undergoes forging, precision lathing, and heat treatment to achieve a surface hardness of HRC 48-53. This hardness range ensures optimal wear resistance while maintaining sufficient elasticity to withstand shock loads during digging operations. The bushing features a double flange design with an inner diameter of 80 mm, outer diameter of 95 mm, length of 95 mm, and flange diameter of 130 mm. This part replaces OEM numbers 205-70-72130 and 2057072130. Cross-references include 205-70-66560, 2057066560, and Caterpillar 4N4539. It is applicable to a wide range of Komatsu excavator models across the 20-25 ton classes.