Angular contact thrust ball bearings

Angular contact thrust ball bearings can only be preloaded axially (fig. 1). The standout of angular contact thrust ball bearings is precision ground so that when the two halves of the bearing are assembled, a given preload is obtained without further adjustment. Keep in mind that preload is also influenced by the interference fit and the operating conditions.
Under load, angular contact thrust ball bearings exhibit similar characteristics as angular contact ball bearings. Therefore, the information provided for angular contact ball bearings is also valid for these bearings. The lifting force for single direction angular contact thrust ball bearings for screw drives in the BSA and BSD series is the same as for angular contact ball bearings (table 1).
For double direction angular contact thrust ball bearings in the BTW and BTM series, the lifting force can be estimated from

Ka1 = 2,85 F0

where

Ka1
=
lifting force
Fo
=
preload on bearings before external axial load is applied

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