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 5855-00-904-9469
NSN 5990-01-359-8334
NSN 5950-00-458-8391
NSN 6220-00-251-5600
NSN 6240-00-079-0112
NSN 5985-01-455-3870
NSN 6150-00-928-0790
NSN 7035-01-261-9850
NSN 6145-01-414-2195
NSN 6145-01-364-0346
NSN 5855-00-089-3974
NSN 4140-01-178-5729