Stainless Steel thrust ball bearings consist of two precision chrome steel washers (ring) and a ball complement spaced by a retainer. They are supplied with ball grooves in the rings for increased capacity. Thrust bearings are used under purely axial loads.Thrust ball bearings are classified into those with flat seats or aligning seats depending on the shape of the outer ring seat (housing washer). They are designed to accommodate axial loads only and must not be subjected to any radial load. 

Miniature Thrust Ball Bearings Set 3 parts, 2 Washers and Retained Bearings. Miniature thrust bearings can withstand axial or thrust loads only. There are separate types of miniature thrust axial bearings with either flat races or washers incorporating a groove or raceway for heavier loads.