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 6110-01-532-7465
NSN 5990-01-383-9780
NSN 5920-00-466-3950
NSN 5960-00-989-1251
NSN 2925-00-265-7539
NSN 6685-01-348-9632
NSN 7035-01-285-2240
NSN 6320-00-925-0558
NSN 5945-01-467-2877
NSN 6110-01-445-8316
NSN 6685-01-437-4305
NSN 6145-00-791-9820