Smaller bearings are available with either a flat seat surface on the housing washers or with a sphered seat surface. Bearings with sphered housing washers can be used together with sphered seat washers to compensate for misalignment between the housing and shaft. The sphered seat washers are available from SKF, but must be ordered separately.
Double direction thrust ball bearings can accommodate axial loads acting in both directions and can thus serve to axially locate a shaft in both directions. They must not be subjected to radial load.