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 5996-01-449-3662
NSN 5996-00-156-5967
NSN 5975-01-052-1433
NSN 5985-01-337-2476
NSN 6150-01-556-2406
NSN 5950-01-090-1161
NSN 5935-01-587-4022
NSN 5990-00-583-9577
NSN 7035-01-545-5852
NSN 6145-00-669-6795
NSN 6645-01-510-3496
NSN 6240-01-623-0340