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 5920-01-117-2745
NSN 5930-01-578-9358
NSN 6130-01-355-7793
NSN 5835-01-392-0575
NSN 5975-00-905-5194
NSN 5925-01-409-2616
NSN 5996-00-624-7292
NSN 5996-00-583-9498
NSN 5945-01-080-4358
NSN 5935-00-711-2037
NSN 6685-00-100-4753
NSN 6685-01-248-4463