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 5950-00-349-3125
NSN 5990-00-689-5736
NSN 6110-01-560-6285
NSN 2925-01-660-0669
NSN 6240-01-083-0867
NSN 6110-00-076-2099
NSN 6145-01-523-2004
NSN 5895-01-188-8682
NSN 4140-00-262-9921
NSN 5990-00-444-9993
NSN 5835-01-229-6964
NSN 6240-01-449-2883