The size of bearings will change due to changes in material structure during operation. This transformation is influenced by temperature, time, and stress.

In order to avoid unacceptable dimensional changes due to structural changes in materials during work, bearing materials must undergo special heat treatment.

According to different types of bearings, standard bearings are made of steel that has undergone quenching and induction hardening heat treatment, with a recommended maximum operating temperature between 120 and 200 degrees. The maximum achievable working temperature is directly related to the heat treatment process. If the normal operating temperature of an application is higher than the recommended maximum temperature, bearings with higher stability levels should be selected. If the bearing needs to operate continuously at high temperatures, the dynamic load capacity of the bearing may need to be adjusted.