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 5905-00-446-2772
NSN 5835-01-326-3664
NSN 5985-00-849-0055
NSN 5895-01-493-4396
NSN 5905-01-403-2806
NSN 5975-01-350-3425
NSN 5935-00-403-5388
NSN 5975-01-544-0487
NSN 6220-00-527-1177
NSN 6685-01-563-8487
NSN 6620-00-400-4237
NSN 6240-01-242-0150