Preload by axial displacement
This preload method offers significant advantages in terms of system rigidity. However, depending on the bearing internal design and ball material, preload increases considerably with rotational speed as a result of centrifugal forces.
Universally matchable bearings or matched bearing sets are manufactured so that when mounted properly, they attain their predetermined axial displacement and proper preload values (fig. 1).
With single bearings, precision matched spacer rings must be used.