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 6150-00-669-6118
NSN 5910-01-474-2376
NSN 6320-01-488-5581
NSN 5998-01-115-9214
NSN 5998-01-432-0101
NSN 6135-01-079-7852
NSN 6645-00-287-9192
NSN 5996-01-181-4326
NSN 5945-01-476-7732
NSN 5920-01-323-6369
NSN 6650-01-013-9334
NSN 5935-01-467-7904