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 5855-01-588-1606
NSN 6610-01-440-9913
NSN 2925-01-541-5031
NSN 5990-01-178-5091
NSN 5920-00-499-8285
NSN 6610-01-339-9222
NSN 5920-00-840-8409
NSN 7035-01-437-4137
NSN 5930-01-117-7736
NSN 5835-00-113-6090
NSN 6320-00-082-5868
NSN 5835-00-050-4330