Bottom Roller Track Roller For John Deere 27D Excavator Heavy Duty 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.

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