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 5925-01-444-0929
NSN 6645-01-508-6028
NSN 5920-01-322-8928
NSN 5895-01-432-2869
NSN 6110-01-294-6483
NSN 5975-01-535-0066
NSN 5990-01-658-9964
NSN 6610-01-519-3080
NSN 5920-00-980-4112
NSN 5950-01-650-6065
NSN 5999-01-181-5469
NSN 6610-00-659-1603