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Temperature limits

The permissible operating temperature for spherical roller bearings can be limited by:
  • the dimensional stability of the bearing rings
  • the seals
  • the lubricant
Where temperatures outside the permissible range are expected, contact SKF.

Bearing rings

SKF spherical roller bearings undergo a special heat treatment. The bearings are heat stabilized up to at least 200 °C (390 °F).

Seals

The permissible operating temperature for seals depends on the seal material:
  • NBR: –40 to +90 °C (–40 to +195 °F)
    Temperatures up to 120 °C (250 °F) can be tolerated for brief periods.
  • HNBR: –40 to +150 °C (–40 to +300 °F)
  • FKM: –30 to +200 °C (–20 to +390 °F)
Typically, temperature peaks are at the seal lip.

Lubricants

Temperature limits for the greases used in sealed SKF spherical roller bearings are provided in table 1. For temperature limits of other SKF greases, refer to Selecting a suitable grease.

When using lubricants not supplied by SKF, temperature limits should be evaluated according to the Traffic light concept.


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