Track roller for Komatsu, Hitachi, Kato, Catepillar, Sumitomo, Kobelco etc..Certificate:ISO9001, Japan KCX Material:45Mn SCSiMn2H,SCMn3B,50Mn surface quenching:HRC 47-52 hardening depth:top 11-13mm,bottom 4-6mmKOMATSUPC05,07HITACHIEX200-2~5/EX220-2~5KOMATSUPC20-1~7(steel)HITACHIEX300-1KOMATSUPC20(rubber)HITACHIEX300-2~5KOMATSUPC25/PC30-2(rubber)HITACHIEX400-1KOMATSUPC30HITACHIEX400-2~5KOMATSUPC40 ...