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 6150-01-580-4315
NSN 6240-01-470-3451
NSN 5950-00-178-0362
NSN 6240-01-031-5505
NSN 5990-01-212-2037
NSN 5915-00-983-0713
NSN 5920-00-452-3889
NSN 5905-01-440-7331
NSN 5996-00-237-5146
NSN 5930-01-136-8396
NSN 4140-01-441-1238
NSN 5835-00-466-8544