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EX55 HITACHI 50Mn Steel Bottom Track Rollers

Roller Shell: Induction hardening on tread surface + tempering. Surface Hardness: HRC 50–58 (hardened layer depth: 4–7 mm) for wear resistance. Core Hardness: HRC 28–35 to absorb impact loads. Shaft: Quenching and tempering for balanced strength. Surface Hardness: HRC 50–55; Core Hardness: HRC 30–38.