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 5985-01-257-7362
NSN 2925-01-004-5627
NSN 5910-00-250-9390
NSN 6145-01-282-8258
NSN 5930-00-915-6401
NSN 6145-01-065-0799
NSN 5998-01-353-6855
NSN 6110-00-519-5339
NSN 6135-00-546-6273
NSN 6685-01-119-1579
NSN 5915-01-124-2088
NSN 5915-00-597-0038