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 4140-01-414-7093
NSN 2925-01-653-9571
NSN 5925-01-420-5439
NSN 6220-01-478-4348
NSN 5930-01-431-0594
NSN 6150-00-394-8888
NSN 6220-00-358-7334
NSN 4140-01-346-2112
NSN 5855-01-156-0417
NSN 2925-01-136-1095
NSN 6645-01-597-2222
NSN 5920-01-385-8307