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 5835-01-043-1576
NSN 5895-01-016-4528
NSN 5930-01-381-3155
NSN 6620-01-029-3705
NSN 5930-00-306-7251
NSN 5915-01-438-1550
NSN 5835-01-218-5560
NSN 5835-00-841-2650
NSN 2925-01-032-3814
NSN 5990-00-753-8870
NSN 6685-01-595-4729
NSN 6320-00-242-3300