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 5960-00-003-2725
NSN 5895-01-145-5358
NSN 5960-00-109-2806
NSN 2925-01-583-5619
NSN 7035-01-449-9138
NSN 5996-01-512-2040
NSN 5930-01-449-3136
NSN 2925-01-440-9912
NSN 6645-01-210-2223
NSN 6620-01-098-9866
NSN 5985-01-270-7632
NSN 6645-01-114-8044