Temperature Guidelines For Heating Or Cooling Rolling Element Bearings For Installation

Temperature Guidelines For Heating Or Cooling Rolling Element Bearings For Installation

These maximum and minimum temperatures, as well as maximum time at temperature limits, have been established to prevent metallurgical transformation of steel components, and potential, detrimental physical changes in seals or non-metallic components. During the manufacturing process, bearing rings and rolling elements are heat treated to define the strength, hardness and dimensional stability for proper operation. Heating or cooling bearings or bearing components beyond these limits may affect performance.

These suggestions are merely guidelines and, as new data is developed, the values as shown may change.
Always use protective safety equipment and clothing when handling parts that have been heated or cooled. 
Never heat a bearing with a torch, as localized heating will irreparably damage bearing components. 
Never rapidly heat or freeze a bearing or bearing component. 
Only use approved equipment, methods and controls to achieve desired temperature. 
Always follow OEM instructions to ensure bearings and rings are properly positioned after heating or cooling.


Standard class bearings or rings (with metallic cages and without seals):
  • Include Class 2, 4, 7, K, N, ABEC-1 and ABEC-3
  • 93°C (200°F) - 24 Hours
  • 121°C (250°F) - 8 Hours
Precision bearings or rings (with non-metallic cages and polymer or elastomer seals):
  • Special considerations may apply for phenolic cages or special fluorocarbon lip seals.
  • Include Class 3, 0, 00, 000, C, B, A, AA, ABEC 5 and 7
Precision and super-precision class bearings and rings (any)
  • 66°C (150°F) - 24 Hours
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