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 5985-00-203-1200
NSN 6685-01-240-2360
NSN 5855-01-423-1497
NSN 5960-01-052-9577
NSN 5950-01-442-6188
NSN 4140-00-715-0010
NSN 5895-01-354-0790
NSN 6130-00-453-4821
NSN 6650-00-216-6365
NSN 5855-01-579-3864
NSN 2925-01-069-5324
NSN 5950-00-093-3097