Permissible speed

The speed ratings in the product tables indicate:
  • the reference speed, which enables a quick assessment of the speed capabilities from a thermal frame of reference
  • the limiting speed, which is a mechanical limit that should not be exceeded unless the bearing design and the application are adapted for higher speeds

For additional information, refer to Operating temperature and speed.

SKF recommends oil lubrication for bearings with a ring centred cage. When these bearings are grease lubricated, the ndm value is limited:
  • for bearings with an LA, LB, LL, MA, MB, ML or MP cage
    → ndm ≤ 250 000 mm/min
  • for bearings with a PA or PHA cage
    → ndm ≤ 450 000 mm/min
bearing mean diameter [mm]
= 0,5 (d + D)
rotational speed [r/min]
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