Temperature limits

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

Bearing rings

The rings of SKF hybrid bearings are heat stabilized up to at least:
  • 120 °C (250 °F) for basic design hybrid deep groove ball bearings
  • 150 °C (300 °F) for hybrid cylindrical roller bearings and XL hybrid deep groove ball bearings
On request, SKF can supply hybrid bearings with rings stabilized for operating temperatures up to 300 °C (570 °F).

Cages

Steel, brass or PEEK cages can be used at the same operating temperatures as the bearing rings of standard hybrid bearings. For temperature limits of other polymer cages, refer to Cage materials.

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.
  • 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 the grease used in sealed SKF hybrid deep groove ball bearings are provided in table 1. For temperature limits of other SKF greases, refer to SKF greases..
When using lubricants not supplied by SKF, temperature limits should be evaluated according to the SKF traffic light concept.
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