Bearing in operation, its size will be due to changes in the structure of the material changes. This shift by temperature, time and stress influence.
     In order to avoid changing the structure of the material and dimensional changes are not allowed in the work, bearing materials must be special heat treatment.
     Depending on the bearing type, standard bearings is quenching and induction hardening heat treatment of steel with the recommended maximum operating temperature between 120-200 degrees. You can reach the maximum operating temperature and heat treatment process has a direct relationship. If an application's normal operating temperature higher than the recommended maximum temperature, the higher should be used in steady progression of bearings. If the bearings need continuous work at high temperatures, dynamic load capacity of the bearing may need to make adjustments