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 5835-00-677-9659
NSN 5975-01-196-2031
NSN 6645-01-374-6343
NSN 6240-01-361-3499
NSN 5996-00-304-8196
NSN 5945-01-361-8845
NSN 6620-01-575-9561
NSN 5999-01-182-5447
NSN 5835-01-201-4375
NSN 6135-01-054-2462
NSN 5920-01-604-5820
NSN 5990-01-060-3687