Many problems with bearing applications revolve around operating a standard bearing product in heat related applicatons. The typical bearing has been processed in a heat treatment cycle that provides dimensional control only up to 250F or 300F (121C – 148C). Bearing steel grows when heat is applied to it. It contracts to the original size, when cooled. Operating above the heat stabilization temperature may allow changes to the metallurgical structure, thus permanently deforming the product and limiting its ability to return to its original size. It also affects the hardness and operating clearances.

It is always important to examine the temperature limit of each component in a bearing. The component with the lowest temperature is the maximum limit at which the bearing can be operated at. As an example, the maximum temperature for a typical sealed bearing with nitrile rubber seals is 250F(121C). Therefore, a standard sealed bearing will not operate properly above 250F(121C). Don’t forget to include the grease or oil temperature limits into your analysis.

Related Reference Materials

• Bearing Material Temperature Limits
• Proper Bearing Handling
• The Basics of Bearing Life
• Solving Bearing Issues in
• Electric Motors
• Ceramic Hybrid Bearing
• Performance Advantages