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 5905-01-607-6163
NSN 6320-01-491-0327
NSN 6110-00-243-1646
NSN 6105-01-140-3017
NSN 6220-01-597-2599
NSN 6320-01-372-2796
NSN 5920-01-429-4631
NSN 5895-01-119-3942
NSN 5855-00-185-1560
NSN 5895-00-457-0571
NSN 6240-01-377-2560
NSN 5985-01-206-2434