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Recommended shaft and housing fits

Diameter tolerances for bearing seats

Shaft and housing seats for super-precision angular contact ball bearings, cylindrical roller bearings and double direction angular contact thrust ball bearings should be manufactured to the diameter tolerances recommended in:
  • table 1 for shaft seat tolerances
  • table 2 for housing seat tolerances
For recommendations for other super-precision bearings, refer to the relevant product section of:
Values of appropriate ISO tolerance classes for super-precision bearings are listed in:
The location of the commonly used tolerance classes relative to the bearing bore and outside diameter surface are shown in (fig. 1).

Selecting bearings to achieve preferred fits

Angular contact ball bearings and cylindrical roller bearings operating under normal loads and moderate speeds, should be selected to attain the interference/clearance values listed in:
Diameter deviations of the bearings are provided on the package of super-precision angular contact ball bearings.

For extreme conditions, such as very high speeds or heavy loads, contact the SKF application engineering service.

For double direction angular contact thrust ball bearings (BTM and BTW series), the outside diameter of the housing washer is manufactured to tolerances such that sufficient radial clearance in the housing seat is obtained. Therefore, for bearings in the BTW and BTM series mounted adjacent to an appropriate cylindrical roller bearing in the same housing seat, tolerances tighter than those recommended in table 2 should not be used. For additional information, refer to Double direction angular contact thrust ball bearings.
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