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 6645-01-627-8040
NSN 5925-01-258-4640
NSN 5915-01-501-2590
NSN 6110-01-653-5038
NSN 5925-01-498-7886
NSN 5996-01-359-9931
NSN 6135-01-026-9960
NSN 5999-00-959-4415
NSN 7035-00-252-7467
NSN 6240-01-345-0526
NSN 5935-01-290-7761
NSN 6135-01-445-6589