Temperature limits
The permissible operating temperature for ball bearing units is, depending on unit variant, mainly limited by:
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the housing material
- The permissible operating temperature for housings made of composite materials is –20 to +80 °C (–5 to +175 °F). Temperatures up to 100 °C (210 °F) can be tolerated for brief periods. Other housing materials do not limit the permissible operating temperature of the unit.
- the PA66 cage (→ Cages)
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the bearing seals and back seals
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The permissible operating temperature for NBR seals is –40 to +100 °C (–40 to +210 °F). Temperatures up to 120 °C (250 °F) can be tolerated for brief periods.
Typically, temperature peaks are at the seal lip.
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The permissible operating temperature for NBR seals is –40 to +100 °C (–40 to +210 °F). Temperatures up to 120 °C (250 °F) can be tolerated for brief periods.
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the lubricant
- Temperature limits for the greases used in insert bearings are provided in table 1. 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.
For high temperature applications with operating temperatures > 120 °C (250 °F) and ≤ 350 °C (660 °F), refer to Insert bearings and ball bearing units for high temperature applications.
