Temperature limits

The permissible operating temperature for drawn cup needle roller bearings can be limited by:
  • the dimensional stability of the bearing rings and rollers
  • the cages
  • the seals
  • the lubricant
When temperatures outside the permissible range are expected, contact the SKF application engineering service.

Bearing rings and rollers

SKF drawn cup needle roller bearings undergo a special heat treatment. The bearings are heat stabilized up to at least 140 °C (285 °F).

Cages

Steel cages can be used at the same operating temperatures as the bearing rings and rollers. For temperature limits of polymer cages, refer to Cage materials.

Seals

The permissible operating temperature for seals depends on the material:
  • NBR seals:
    –40 to +100 °C (–40 to +210 °F)
    Temperatures up to 120 °C (250 °F) can be tolerated for brief periods.
  • PUR seals:
    –30 to +100 °C (–20 to +210 °F)
  • FKM seals:
    –30 to +200 °C (–20 to +390 °F)

Lubricants

Temperature limits for greases used in capped drawn cup needle roller bearings are provided in table 1 and for full complement bearings in table 2. Temperature limits for other SKF greases are provided under Lubrication.
When using lubricants not supplied by SKF, the temperature limits should be evaluated according to the SKF traffic light concept.
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