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 7035-01-150-6303
NSN 6685-00-484-2178
NSN 6685-01-132-4637
NSN 6130-01-265-8696
NSN 6650-00-944-1399
NSN 5999-01-257-8313
NSN 6240-00-001-1524
NSN 5905-00-203-9524
NSN 6620-01-075-5299
NSN 5915-01-367-2056
NSN 6220-01-060-1096
NSN 6150-00-928-3711