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.
Austria 
Republic of Korea 
Greece Classification: Thrust ball bearings
NSN 5990-01-652-7373
NSN 6645-01-400-1383
NSN 6110-00-337-8037
NSN 6685-01-418-0406
NSN 7035-01-547-7415
NSN 2925-01-601-5050
NSN 5895-01-448-6400
NSN 5920-01-629-2858
NSN 5915-01-521-9486
NSN 6320-01-556-2011
NSN 5960-01-322-4341
NSN 5930-01-288-2479