Tonkee Machinery 로고
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.
