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.
Canada 
New Zealand 
United Kingdom Classification: Thrust ball bearings
NSN 5996-00-147-9323
NSN 6620-00-153-0982
NSN 5990-01-443-2931
NSN 5965-00-284-5856
NSN 6240-00-372-4841
NSN 5985-01-463-9112
NSN 5935-01-359-8213
NSN 5990-01-286-0601
NSN 5996-01-005-1440
NSN 6610-01-485-3074
NSN 6110-01-453-9302
NSN 6685-01-472-7195