The permissible operating temperature for deep groove ball bearings can be limited by:

1.the dimensional stability of the bearing rings and balls

2.the cage

3.the seals

4.the lubricant

Where temperatures outside the permissible range are expected, 

Bearing rings and balls

SKF deep groove ball bearings are heat stabilized up to at least 120 °C (250 °F).

Cages

Steel, stainless steel, brass or PEEK cages can be used at the same operating temperatures as the bearing rings and balls. For temperature limits of cages made of other polymer materials, 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.

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  deep groove ball bearings capped on both sides are provided in table .

 For temperature limits of other  greases, refer to Selecting a suitable grease.