Permissible speed

The permissible speed is the lower value of:
SKF recommends oil lubrication for bearings with a ring centred cage. When these bearings are grease lubricated (→ Adjustments of relubrication intervals due to operating conditions and bearing types, Cylindrical roller bearings) the 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
where
dm
bearing mean diameter [mm]
= 0,5 (d + D)
n
rotational speed [r/min]
Higher speeds are possible with modified bearing designs or with additional heat dissipation from the application. For additional information, contact the SKF application engineering service.
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