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 5835-00-949-3018
NSN 5996-00-826-8837
NSN 5975-01-262-7330
NSN 5975-01-411-6054
NSN 5998-01-572-9644
NSN 5835-00-494-8419
NSN 6610-01-421-5367
NSN 5996-01-383-4029
NSN 6105-00-238-2979
NSN 6320-01-466-4175
NSN 6135-00-120-1034
NSN 6145-00-686-8651