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 5945-00-221-4572
NSN 5998-01-551-6703
NSN 6220-00-021-4469
NSN 5965-01-571-7560
NSN 7035-00-946-2642
NSN 5999-01-463-3026
NSN 5950-01-448-6105
NSN 5965-01-245-6585
NSN 6145-01-253-9094
NSN 5945-01-422-4195
NSN 6105-01-268-9380
NSN 5925-01-298-2811