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 
Brazil 
Spain 
Republic of Korea 
Greece 
Turkey Classification: Thrust ball bearings
NSN 6320-01-512-2031
NSN 5930-01-152-1909
NSN 5835-01-090-0784
NSN 2925-01-129-1261
NSN 4140-01-463-5707
NSN 6620-00-235-4938
NSN 5960-01-206-8809
NSN 5996-00-069-3515
NSN 5905-01-573-3691
NSN 5910-01-450-4309
NSN 6105-01-432-2249
NSN 6150-00-114-2785