Does the rolling contact surface need to be face hardened?
Yes, increase the surface hardness by face hardening before use. We recommend HRC58 (≒HV653) or higher as the rolling contact surface hardness, and generally around 2mm, although it varies depending on the size of the LM roller, as the depth of the hardened layer. If the hardness of the rolling contact surface is low or it cannot be face hardened, the load rating should be multiplied by the hardness coefficient in reference to the following hardness coefficient (fH).