... 1.product introductionState-of-the art machiningEach roller shaft is engineered drop-forged and machined by the utilization of the ... heat treated to ensure long wear life and stress resistance.Precision careEach roller is precision machined to house special high ... . Replacement parts of track roller for Caterpillar,Komatsu,Hitachi,Kobelco,Mitsubishi,Sumitomo,Daewoo,Hyundai,Samsung and etc. No.Part No ...