08 Ago 1/2/3/4/6 Bottom Roller Track Roller For IHI IHI28J Mini Excavator Undercarriage
Side cover: QT 450-10, strength as follows: tensile strength ob (MPa): 2450 yield strength 00.2 (MPa): 2310 hardness: 160 ~ 210 hb. Roller : 45 # carbon steel or 40 Cr. Quenching of HRC25-30 and surface quenching of HRC 52-58....