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 6650-00-950-4107
NSN 6240-01-559-0684
NSN 4140-01-603-7932
NSN 5925-01-425-2679
NSN 4140-01-023-0407
NSN 5960-00-770-3701
NSN 5950-01-556-3064
NSN 5915-01-632-1160
NSN 5935-01-204-6195
NSN 5835-01-238-3381
NSN 6610-00-113-2245
NSN 5998-01-576-0391