This International Standard specifies preferred boundary dimensions for single-direction and doubledirection
thrust bearings with flat back faces.In addition, it gives the minimum bore diameters of housing washers and maximum outside diameters
of shaft washers of bearings in dimension series 11, 12, 13, 14, 22, 23 and 24.Guidelines for the extension of this International Standard for single-direction thrust bearings are
given in Annex A.