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 6620-01-440-9810
NSN 5920-00-905-4769
NSN 5910-01-386-4231
NSN 2925-01-101-4655
NSN 5975-01-067-2507
NSN 6650-01-440-2617
NSN 5920-00-326-9901
NSN 4140-01-490-3752
NSN 5945-00-100-1261
NSN 5975-00-357-6136
NSN 6650-01-309-9152
NSN 6620-00-902-9843