Single direction thrust ball bearings consist of a shaft washer, a housing washer and a ball and cage thrust assembly. These bearings are able to accommodate axial loads in one direction only. Single direction thrust ball bearings of series 511,512,513 and 514 have plain housing washers. For applications where some misalignments may occur, single direction thrust ball bearings of the series 532,533 and 534 are also available with a spherical housing washers. These bearings may be applied either direct to a sphere shaped bearing seats or, they may be used together with seating washers of series U, U3 or U4.