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 5835-01-043-1576
NSN 5996-01-112-7385
NSN 5985-01-469-5784
NSN 5915-01-131-1719
NSN 5950-00-833-3193
NSN 5996-00-250-6556
NSN 6645-01-494-3845
NSN 5835-00-364-0816
NSN 5950-01-392-3624
NSN 5985-01-394-3850
NSN 4140-00-603-5074
NSN 4140-00-619-8062