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 5998-01-094-8309
NSN 5930-01-594-6106
NSN 5985-01-481-4770
NSN 6220-00-216-7284
NSN 5855-01-093-3080
NSN 5950-01-427-3723
NSN 6620-00-035-5813
NSN 7035-00-543-3272
NSN 6610-00-862-5901
NSN 2925-01-364-7926
NSN 4140-01-363-6060
NSN 5895-01-047-6825