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 5935-01-147-4977
NSN 5975-00-812-9155
NSN 6105-01-385-0502
NSN 6320-00-593-0379
NSN 5999-00-695-0339
NSN 5925-01-277-7066
NSN 6240-00-269-3346
NSN 5960-01-429-5897
NSN 5920-01-426-8517
NSN 6220-01-360-2532
NSN 7035-01-421-4446
NSN 5910-00-554-8753