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 5950-01-150-5560
NSN 5920-00-765-2867
NSN 6240-01-656-4920
NSN 5945-00-118-1103
NSN 5935-01-049-1140
NSN 5935-01-384-6187
NSN 7035-01-626-3229
NSN 5935-01-428-9292
NSN 6610-01-230-9971
NSN 6105-00-248-5772
NSN 5905-01-464-6691
NSN 5915-01-271-3028