W/4 grooves
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.
Classification: Thrust ball bearings
NSN 4140-00-293-7847
NSN 4140-01-497-0033
NSN 6685-00-230-4267
NSN 6320-01-082-2970
NSN 7035-01-368-4801
NSN 6105-00-286-5382
NSN 5835-00-729-9305
NSN 6105-01-608-3125
NSN 6645-00-421-5287
NSN 6685-01-172-0167
NSN 5945-01-521-0916
NSN 5965-00-692-6364