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 
Spain 
Australia Classification: Thrust ball bearings
NSN 5905-01-459-6402
NSN 5920-01-564-6182
NSN 6685-01-544-9697
NSN 6220-01-124-5607
NSN 5905-01-064-5423
NSN 5999-01-361-8950
NSN 5950-00-123-5662
NSN 5895-01-161-7157
NSN 5975-01-564-0252
NSN 6150-01-151-3016
NSN 5905-01-502-9940
NSN 6685-00-163-3116