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 Army 
Dept. of the Air Force 
Dept. of the Navy 
Poland 
Brazil 
Spain 
Australia 
Canada 
New Zealand 
France 
Germany 
Republic of Korea 
Portugal 
Greece 
Turkey Classification: Thrust ball bearings
NSN 5945-01-185-0828
NSN 6135-01-252-0315
NSN 6240-00-383-2573
NSN 5960-00-575-5116
NSN 5999-01-350-6635
NSN 5990-00-764-3773
NSN 5999-01-263-9366
NSN 5895-01-616-1748
NSN 6135-01-089-4888
NSN 6645-01-303-8336
NSN 4140-01-302-4487
NSN 5945-00-141-0160