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 6645-00-551-8291
NSN 6645-01-566-3205
NSN 5996-00-351-2369
NSN 6130-01-143-3611
NSN 6110-01-472-3641
NSN 5895-00-249-1079
NSN 5965-01-215-3184
NSN 5975-00-109-5370
NSN 5935-00-243-8609
NSN 5999-01-433-0888
NSN 6685-00-527-6545
NSN 6105-01-139-4778