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 6610-01-415-5877
NSN 6220-01-524-5801
NSN 5999-01-397-4235
NSN 5999-01-154-1058
NSN 6110-00-882-7117
NSN 6610-00-327-7540
NSN 5950-01-607-8025
NSN 5835-01-241-1090
NSN 5930-00-283-4250
NSN 6220-00-205-2040
NSN 5930-00-159-7467
NSN 5996-00-166-0037