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 6320-00-590-9342
NSN 6240-00-079-1759
NSN 5855-01-222-1242
NSN 5990-01-303-6110
NSN 5855-00-198-3197
NSN 5925-01-490-6296
NSN 6220-00-489-1440
NSN 5895-01-029-3791
NSN 6685-01-283-5389
NSN 6145-00-437-8960
NSN 5905-00-664-4218
NSN 6645-01-419-4257