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 6610-01-563-1809
NSN 5965-01-317-5020
NSN 6320-00-238-9973
NSN 6135-01-056-4609
NSN 2925-01-484-8556
NSN 5965-00-481-9737
NSN 6620-01-274-0203
NSN 5945-00-216-8755
NSN 2925-01-580-1527
NSN 6130-00-287-2932
NSN 5975-01-625-1004
NSN 6240-00-954-0124