Temperature limits

The permissible operating temperature for Y-bearings can be limited by:
  • the dimensional stability of the bearing rings and balls
  • the cage
  • the seals
  • the lubricant
When temperatures outside the permissible range are expected, contact the SKF application engineering service.

Bearing rings and balls

Y-bearings undergo a special heat treatment. The bearing rings and balls are heat stabilized up to at least 150 °C (300 °F).


For temperature limits of PA66 cages, refer to Cage materials.


The permissible operating temperature for NBR seals is –40 to +100 °C (–40 to +210 °F). Temperatures up to 120 °C (250 °F) can be tolerated for brief periods.


Temperature limits for the greases used in Y-bearings are provided in table 1. Temperature limits for other SKF greases are provided under SKF greases.
When using lubricants not supplied by SKF, the temperature limits should be evaluated according to the SKF traffic light concept.
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