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 5950-00-443-8551
NSN 6220-00-554-5937
NSN 5920-01-240-6373
NSN 5999-01-287-8556
NSN 6220-01-571-4707
NSN 2925-00-580-4931
NSN 5965-01-580-2171
NSN 6130-00-449-3253
NSN 6145-01-298-8914
NSN 6110-00-452-0448
NSN 5965-00-617-3847
NSN 6135-01-333-2540