SKF recommends oil lubrication for bearings with a ring centred cage (designation suffix MA or MB). When these bearings are grease lubricated (→ Lubrication) the ndm value is limited to 250 000 mm/min.
|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.
For matched bearings, the permissible speed calculated for a single bearing should be reduced to approximately 80% of the quoted value.