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 4140-01-406-5344
NSN 5855-01-160-3802
NSN 4140-00-902-7744
NSN 6220-00-389-6215
NSN 5925-01-204-6888
NSN 5930-01-585-5855
NSN 5920-00-848-0264
NSN 5915-00-161-4409
NSN 5960-01-260-7430
NSN 5985-00-974-9961
NSN 5960-00-114-4916
NSN 6150-00-881-3439