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 6685-01-422-1181
NSN 5965-00-905-6895
NSN 6320-01-369-5014
NSN 5910-01-633-9963
NSN 5975-01-645-4523
NSN 6685-01-361-9258
NSN 4140-01-468-4689
NSN 5998-01-403-2586
NSN 5996-00-146-1275
NSN 5998-01-173-4712
NSN 5996-01-485-0305
NSN 5895-01-509-3285