An item of any peripheral shape usually having one flat or spherical surface and a centrally located hole. It is designed for applications involving moving (kinetic) loads. Except for items fabricated from bearing quality synthetic (plastic) or composed of multilayer material, one bearing surface must either have a specific surface finish designation of 32 microinch (0.8 micrometre) or less, arithmetical average (aa) (arithmetic mean deviation) or one of the following conditions: be lapped or ground; have visible or detectable means of lubrication; grooves, indentations; or self-lubrication. The thickness must not exceed 25 percent of the outside diameter of the shortest distance between peripheral flats (when thickness and/or outside diameter is designated as a tolerance dimension, the maximum dimension will be used to determine compliance). Excludes straight, tubular (without flange) items having a bearing surface(s) parallel to the axis of the bore only. See also washer, flat and spacer, sleeve.
Dept. of the Navy 
Turkey Classification: Thrust ball bearings
NSN 5915-01-028-4466
NSN 5950-01-538-8276
NSN 2925-01-385-6661
NSN 5965-01-150-1920
NSN 6220-00-881-2596
NSN 6645-01-633-1852
NSN 5935-01-370-4111
NSN 5960-01-147-2303
NSN 6620-01-305-4061
NSN 2925-01-141-7563
NSN 5999-01-193-8883
NSN 4140-00-011-2988