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 5960-01-411-5899
NSN 6610-00-226-4710
NSN 5835-01-268-1924
NSN 5945-00-862-9448
NSN 6610-01-085-0804
NSN 5915-01-024-3433
NSN 2925-00-433-5429
NSN 5905-01-612-1444
NSN 5996-01-132-6748
NSN 6150-01-503-2361
NSN 6220-00-761-2205
NSN 6645-00-334-9225