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 5975-01-434-5036
NSN 6105-01-394-9823
NSN 6150-00-274-5571
NSN 6620-01-517-0014
NSN 5930-00-593-5658
NSN 6685-01-116-4526
NSN 5905-01-352-5824
NSN 7035-01-317-4227
NSN 5960-00-481-6677
NSN 5915-00-661-2223
NSN 5965-01-360-4329
NSN 6220-00-660-5539