... Excavator Track roller for Hitachi EX200-1 1.MATERIAL:50MN 2.APERTURE ... :18MM 3.HOLE DISTANCE:318/101.6MM 4.HARDNESS:HRC50~57 Excavator Track roller for Hitachi ... heat treatment, welding, oiling and Assy.1.Advantages / Features:1.using the milling machine to guarantee ... parts of track roller for Caterpillar,Komatsu,Hitachi,Kobelco,Mitsubishi,Sumitomo,Daewoo,Hyundai,Samsung and ...