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 6105-01-487-2481
NSN 5999-01-416-2484
NSN 5950-00-648-7193
NSN 6150-01-282-2788
NSN 6645-01-622-6161
NSN 6650-00-205-6282
NSN 6130-01-400-3651
NSN 5950-00-298-1936
NSN 5895-00-451-6174
NSN 6650-01-122-0169
NSN 6130-01-258-4130
NSN 5905-00-927-8546