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 
Brazil 
Spain 
Singapore 
Belgium 
Canada 
France 
Portugal 
Greece 
Turkey Classification: Copper screws, nuts, bolts, rivets, and other fasteners not threaded
NSN 6110-01-116-4251
NSN 5855-00-149-0766
NSN 5998-00-627-3144
NSN 5965-01-140-9446
NSN 6320-01-144-3810
NSN 4140-01-123-9149
NSN 7035-01-443-3052
NSN 6650-00-159-7117
NSN 6240-01-341-2102
NSN 6130-01-412-3315
NSN 5935-01-112-9796
NSN 5999-00-252-7642