A tubular shaped item with or without flange(s) designed to reduce friction and carry a kinetic load on the surface(s) parallel to the axis of the bore. it must have a visible or detectable means of lubrication or be self-lubricated. the over all length must exceed 25 percent of the outside diameter or the shortest distance between peripheral flats of the body, except for straight tubular (without flange or shoulder) items having a bearing surface(s) parallel to the axis of the bore only. includes items which are divided into two or more segments which include 180 degrees (3.141 radians) or less of the bearing periphery. see also bushing, sleeve; spacer, sleeve; and washer (as modified). excludes pin, hollow.
Dept. of the Air Force 
Dept. of the Navy Classification: Parts, nesoi, for roller bearings or for combined ball/roller bearings, nesoi
NSN 5996-01-400-1640
NSN 6240-01-415-5581
NSN 6650-01-171-8539
NSN 6650-01-392-6076
NSN 6645-01-515-9951
NSN 5895-01-515-6811
NSN 5998-01-121-5814
NSN 4140-01-528-6681
NSN 6610-00-400-9355
NSN 5998-00-277-4307
NSN 6620-00-243-1759
NSN 6645-00-400-3115