Material                           45# high-grade carbon steel or 40CR

Tempering hardness                  HB240-260

The depth of the high frequency         2mm-3mm

High frequency hardness                HRC55°±2°

Chrome plating thickness                0.03mm-0.06mm

Chromium layer hardness                HV800-1000vpn

Straightness                           ≤0.08mm/m

Surface roughness                        Ra0.03um- Ra0.06um

Outside diameter tolerance                   f7

Kind of steel                    45#              Tensile strength N/mm     ≥647

Linearity                       0.3-1/1000    Specific elongation          ≥4

Precision of size                  HB                                  207

Roughness of inner hole         0.4-0.8

steel