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 
Portugal Classification: Thrust ball bearings
NSN 6110-01-461-5116
NSN 5985-00-961-6004
NSN 6110-01-316-6958
NSN 6145-01-313-9869
NSN 5950-01-346-0598
NSN 5998-01-529-6471
NSN 5855-01-436-2862
NSN 5990-01-364-0813
NSN 6620-00-246-5159
NSN 6220-00-389-6215
NSN 5895-01-590-0111
NSN 5985-01-088-5739