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 
Spain 
Republic of Korea 
Greece 
Turkey Classification: Copper screws, nuts, bolts, rivets, and other fasteners not threaded
NSN 6150-00-196-5257
NSN 6620-01-231-3528
NSN 5996-00-449-1346
NSN 5999-01-055-9502
NSN 5990-00-879-0476
NSN 6240-01-008-5267
NSN 5925-01-605-1745
NSN 5905-00-466-1814
NSN 5990-00-226-7894
NSN 5835-01-378-6804
NSN 5910-01-449-1055
NSN 6685-01-063-8297