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 6240-01-508-9627
NSN 5935-01-622-1588
NSN 6135-01-303-0295
NSN 6135-01-606-8140
NSN 5930-01-609-8677
NSN 5965-00-732-3365
NSN 5855-01-381-6052
NSN 5915-01-299-4478
NSN 4140-00-245-2715
NSN 5945-00-104-5922
NSN 6610-00-247-1308
NSN 6610-01-212-9817