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The good functioning of a ball bearing depends on the quality of mating parts. The following points ought to be taken in to consideration while choosing different tolerances of mating parts:

  • Surface roughness and geometrical forms of shafts influence the performance and noise of a bearing.
  • Axial and radial expansion, due to temperature size and direction of the applied load to the bearing. In general, the tightening of the bearing on the shaft or in the housing (depends which one is turning) should become tighter with increased load.
  • Dimensional and functional precision required.
  • Allow for radial fit and running clearance.

The following tolerances are given in µm and may be used only in cases where the groove and the shaft materials have the same thermic dilatation coefficient as has the bearing steel.

Tolerance of shaft


Tolerance of housing


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