Temperature limits

The permissible operating temperature for track runner bearings is mainly limited by:
  • the dimensional stability of the bearing rings and rolling elements
  • the cage
  • the seals
  • the lubricant
When temperatures outside the permissible range are expected, contact the SKF application engineering service.

Bearing rings and rolling elements

SKF track runner bearings undergo a special heat treatment. The bearings are dimensionally stable up to at least:
  • 120 °C (250 °F) for single row cam rollers
  • 150 °C (300 °F) for double row cam rollers
  • 140 °C (280 °F) for support rollers and cam followers

Cages

Cages made of steel can be used at the same operating temperatures as the bearing rings and rolling elements. The permissible operating temperature for cages made of polyamide 66 is –30 to +120 °C (-20 to +250 °F). For additional information, refer to the section Cage materials.

Seals

The permissible operating temperature for seals made of acrylonitrile-butadiene rubber (NBR) is –40 to +100 °C (-40 to +210 °F). For brief periods temperatures up to 120 °C (250 °F) can be tolerated. The permissible operating temperature for sliding rings made of polyamide 66 is –30 to +100 °C (-20 to +210 °F).

Lubricants

Temperature limits for SKF greases are provided in the table. When using lubricants not supplied by SKF, the temperature limits should be evaluated according to the SKF traffic light concept. For detailed information, refer to the section Temperature range - the SKF traffic light concept.