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 5990-01-525-2250
NSN 5950-01-218-5639
NSN 6620-00-136-3468
NSN 6240-01-552-0015
NSN 6105-01-263-5403
NSN 5835-00-969-5771
NSN 6135-00-087-5300
NSN 5910-00-725-7247
NSN 5945-00-151-4623
NSN 6220-01-367-2923
NSN 6320-01-550-3420
NSN 5965-01-367-2275