Temperature limits

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

Bearing rings and rollers

SKF drawn cup needle roller bearings are heat stabilized up to 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 Polymer cages.

Seals

The permissible operating temperature for seals depends on the seal material:
  • NBR: –40 to +100 °C (–40 to +210 °F)
    Temperatures up to 120 °C (250 °F) can be tolerated for brief periods.
  • PUR: –30 to +100 °C (–20 to +210 °F)
  • FKM: –30 to +200 °C (–20 to +390 °F)
    Temperatures up to 230 °C (445 °F) can be tolerated for brief periods.
Typically, temperature peaks are at the seal lip.

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. For temperature limits of other SKF greases, refer to Selecting a suitable SKF grease.
When using lubricants not supplied by SKF, temperature limits should be evaluated according to the SKF traffic light concept.
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