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 7035-01-477-2818
NSN 5945-00-361-5618
NSN 5905-00-167-1693
NSN 5945-01-512-9376
NSN 5920-01-123-9854
NSN 5920-00-694-0483
NSN 5935-01-628-7885
NSN 5930-01-364-1077
NSN 5950-00-142-6550
NSN 4140-01-048-5472
NSN 6145-01-349-4918
NSN 6145-01-495-2671