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 5950-00-694-8701
NSN 6650-00-899-5145
NSN 5935-01-549-2534
NSN 6220-01-461-2910
NSN 5915-01-590-6232
NSN 6650-01-155-1555
NSN 5999-00-225-9489
NSN 5935-00-959-8566
NSN 5905-01-467-7889
NSN 6110-01-232-0071
NSN 6320-00-553-8427
NSN 5975-01-183-3146