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 6220-01-200-8051
NSN 6620-00-416-4131
NSN 6130-01-115-5331
NSN 5999-01-270-9655
NSN 5950-01-065-0016
NSN 6645-00-815-7075
NSN 5960-00-609-6732
NSN 6150-00-810-5581
NSN 5998-01-450-4464
NSN 5965-01-229-0786
NSN 6150-01-163-8793
NSN 6240-01-512-4547