This International Standard specifies the major boundary dimensions of 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. Chamfer dimensions rs and r1s apply only at the corners indicated in figures 1 and 2. No dimensions are given for other corners; however@ they should not be sharp. Maximum chamfer dimensions are given in ISO 582. Guidelines for the extension of this International Standard for single-direction thrust bearings are given in annex A.