Influence of operating temperature

In operation, the dimensions of a bearing change as a result of structural transformations within the material. These transformations are influenced by temperature, time and stress.

To avoid inadmissible dimensional changes as a result of structural transformation, bearing components undergo a special heat treatment (table 1).
Depending on the bearing type, standard bearings made of steels for through-hardening or induction-hardening have a recommended maximum operating temperature between 120 and 200 °C (250 and 390 °F). These maximum operating temperatures are directly related to the heat treatment that was applied. For additional information, refer to the introductory text of the relevant product section.
If the normal operating temperatures of the application are higher than the recommended temperature limit, a bearing with a higher stabilization class should be considered.
For applications where bearings operate continuously at elevated temperatures, the dynamic load carrying capacity of the bearing may need to be adjusted in the life calculations. For additional information, contact the SKF application engineering service.
The satisfactory operation of bearings at elevated temperatures also depends on whether the lubricant retains its lubricating properties and whether the materials used for the seals, cages etc. are suitable (→ Lubrication and Materials for rolling bearings).
For bearings operating at high temperatures requiring a higher stabilization class than S1, contact the SKF application engineering service.
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