Axial stiffness

Single direction bearings

The axial stiffness values for single direction bearings are listed in the product table. They apply to unmounted bearing sets with two bearings arranged back-to-back or face-to-face.

Bearing sets consisting of three or four bearings provide a higher degree of axial stiffness than sets with two bearings. The axial stiffness for these bearing sets is obtained by multiplying the values listed in the product table by a factor listed in table 1. The lower value factor applies to bearings under light axial load (P ≤ 0,05 C) and the larger value to bearings under heavy axial load (P > 0,1 C). To determine the equivalent dynamic bearing load P, refer to Equivalent bearing loads.

Bearing sets with a heavier preload provide an even higher degree of stiffness. However, this should be avoided as heavier preload substantially increases friction and heat generated by the bearing. In cases where an extremely high degree of stiffness is required, the frictional behaviour as a function of increasing preload can be estimated using the simulation tool SKF Spindle Simulator. For additional information, contact the SKF application engineering service.

Double direction bearings

Values for axial and moment stiffness for double direction angular contact thrust ball bearings are listed in the product table and apply to the preload set at the factory. The values do not cover influences from fits or operating conditions.

Cartridge units

For cartridge units, axial stiffness is listed in the product table. The values correspond to those for the included single direction bearings, multiplied by the factors provided in table 1.
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