A circular-shaped item designed to maintain predetermined distance between assembled parts and/or for distributing pressure or preventing endwise movement between member parts. It has a solid cross-section and two flat parallel bearing surfaces. The distance between the bearing surfaces perpendicular to the axis of the centrally located hole shall not exceed 25 percent of the outside diameter. The diameter of the centrally located hole must exceed 75 percent of the outside diameter. Excludes laminated items. For items manufactured from impregnated graphite or lubricated nonmetallic materials, excluding felt or plastics, see gasket. For items manufactured from lubricated plastics, see bearing, washer, thrust. For items manufactured from lubricated felt, see felt, mechanical, preformed. Excludes disk, valve; insulator washer; and shim. See also spacer, plate and spacer, sleeve.
Dept. of the Navy 
Portugal 
Greece Classification: Copper screws, nuts, bolts, rivets, and other fasteners not threaded
NSN 5920-00-552-9145
NSN 6110-01-592-1784
NSN 6620-00-692-9668
NSN 5985-01-264-2344
NSN 6650-01-282-8015
NSN 6105-00-151-7528
NSN 6645-01-551-3703
NSN 5835-01-226-7875
NSN 6145-00-502-1828
NSN 5999-01-199-4313
NSN 6150-01-555-3348
NSN 6650-00-942-2796