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 5905-00-233-4651
NSN 5935-00-258-1746
NSN 6220-00-671-0384
NSN 5930-00-422-1915
NSN 6135-01-020-3805
NSN 7035-00-731-8729
NSN 5998-00-578-8582
NSN 6145-00-862-7069
NSN 6650-01-587-5867
NSN 5895-00-707-6663
NSN 5925-01-334-8402
NSN 6650-01-567-1933