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 5960-01-130-6413
NSN 5920-01-118-9492
NSN 6150-01-582-8661
NSN 6105-01-369-0425
NSN 6105-01-447-0007
NSN 4140-01-231-2286
NSN 6650-01-183-0711
NSN 7035-01-610-9570
NSN 5905-01-309-5437
NSN 6145-01-054-7463
NSN 6685-00-394-7937
NSN 6320-01-443-4972