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 6650-01-036-9083
NSN 6105-01-139-3624
NSN 5935-00-063-9571
NSN 5996-01-116-4670
NSN 5965-01-092-2698
NSN 5895-00-577-4078
NSN 6240-01-432-0819
NSN 6135-01-484-8637
NSN 6150-00-188-8337
NSN 5915-00-133-2847
NSN 5985-01-459-8010
NSN 5855-01-600-0486