Chrome-plated linear axis is a layer of hard chrome plated on the basis of ordinary linear axis, also known as bearing rod, which can be used in environments prone to rust or bad environments. This axis is widely used in industrial robots and moving parts of automatic sliding system devices. : SUJ2 (equivalent) national standard GCR15. Hardness: HRC60±2; Hardened layer depth: 0.8-3mm; Surface roughness: RA0.10m-RA0.35m Straightness material