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 5930-01-246-6225
NSN 5835-00-269-2232
NSN 5960-01-622-0393
NSN 5945-01-475-4695
NSN 4140-00-418-2939
NSN 5985-01-615-4829
NSN 5905-01-170-6127
NSN 5915-00-817-4504
NSN 5925-01-161-9561
NSN 6150-01-386-9205
NSN 6150-01-306-7569
NSN 6130-01-586-4441