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 5925-00-805-3653
NSN 6620-01-512-3032
NSN 5930-01-551-0901
NSN 5915-01-325-3277
NSN 5950-01-317-4386
NSN 5835-00-155-1379
NSN 2925-01-470-5534
NSN 5895-00-417-5529
NSN 5915-01-559-8039
NSN 6240-00-726-1648
NSN 6135-01-645-4653
NSN 6320-00-070-4544