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 
Israel 
Kuwait 
New Zealand Classification: Thrust ball bearings
NSN 6105-01-573-2179
NSN 5915-01-375-1581
NSN 6685-01-503-6537
NSN 5895-01-503-7825
NSN 6685-01-097-9062
NSN 6105-01-146-6945
NSN 5905-01-579-9545
NSN 5915-00-475-9901
NSN 5905-00-164-9826
NSN 6620-00-955-6122
NSN 6645-01-076-4655
NSN 5998-01-550-8505