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 5910-01-373-9068
NSN 2925-01-320-6512
NSN 6110-01-069-2966
NSN 6105-00-419-5979
NSN 6145-01-512-1309
NSN 6135-01-598-9889
NSN 5965-01-599-0799
NSN 6620-00-589-5250
NSN 6135-01-516-8171
NSN 5925-01-398-0517
NSN 5998-01-144-5238
NSN 6145-01-044-0856