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 5996-01-255-6867
NSN 5965-01-456-6622
NSN 5945-01-395-9686
NSN 5910-01-633-9963
NSN 6685-01-048-6411
NSN 5935-01-406-4013
NSN 5965-01-241-9865
NSN 6650-01-521-2077
NSN 7035-00-173-2281
NSN 5895-00-615-9662
NSN 5990-01-106-3786
NSN 5965-01-300-8377