A comprehensive engineers' reference source for radial ball bearings and thrust ball bearing




Misalignment during assembly is a common cause of bearing noise, increased torque, and general poor performance. The free angle of misalignment that a small bearing can tolerate is typically less than 1�.

Bearing Misalignment
  • Locating shoulders on mating components must be parallel to bearing raceway faces.
  • Shaft and housing bores must be concentric. This is particularly true when more than 2 bearings share a common component. For example, if a third bearing is added to the above arrangement, the resulting assembly has almost no tolerance for misalignment of the bearing outer ring.

The free angle of misalignment (qf) of a bearing is the maximum angle between the inner race and outer race axes freely allowed by the bearing. If a bearing is misaligned such that this angle is exceeded, then damage and premature failure can occur.

          (dp >> Dw)

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