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 6320-01-554-0901
NSN 6610-01-083-1446
NSN 5905-01-350-3624
NSN 6130-01-432-2415
NSN 5945-01-093-9651
NSN 6645-01-299-7806
NSN 5855-01-271-6617
NSN 6135-01-647-0386
NSN 4140-00-628-3546
NSN 5905-00-596-0786
NSN 6645-01-091-0009
NSN 5945-00-825-9262