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 Navy 
Turkey Classification: Thrust ball bearings
NSN 6645-01-529-5690
NSN 5855-00-494-9581
NSN 5925-01-544-6846
NSN 6110-00-255-6502
NSN 6645-00-960-6594
NSN 6685-00-718-8056
NSN 6685-00-707-4842
NSN 5998-01-187-0083
NSN 5950-01-304-0579
NSN 5998-01-005-6885
NSN 5999-01-141-6859
NSN 5930-01-661-1257