... ,Kobelco&Hyundai 4.history:more than 15 years Hitachi,Komatsu,Caterpillar,Kobelco excavator parts,excavator mater pins ... and bushings1.raw material:40Cr2.hardness:HRC55-HRC603.model:Hitachi,Komatsu,Caterpillar,Kobelco,Hyundai4.technology:forging+thermal treatment&fine ... years We can be manufacturing bucket pins for Komastu,Hitachi,Caterpillar,Kobeleo,Daewoo,Sumitomo,Hyundai, Mitsubishi,Samsung,etc. ...