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Materials: high-Carbon Chromium Bearing Steel (SUJ-2) Rockwell HRC: 62 ± 2 (SUS 400C = 58HRC) Tolerance: g6 (JIS) Surface Roughness: less than 1.5µm (Rmax) Hardened zone: 0.8 ~ 3.0mm Outer Diameter: 3 ~ 80 (SUJ-2) : 3 ~ 40 (SUS 440C) Order length: 100mm ~ 3000mm Straightness: less than 5µ per 100mm Roundness: less than 3.0µ (Rmax) Cylindricity: Less than 3.0µ (Rmax) Use with : Use with LM**UU, SC**UU in linear motion system as linear actuator.