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 6240-01-156-1565
NSN 5910-00-356-4594
NSN 5990-01-095-8866
NSN 5895-01-258-7054
NSN 6150-01-049-3437
NSN 5910-00-732-1301
NSN 5965-00-342-5126
NSN 6620-01-529-7513
NSN 5905-00-659-0617
NSN 5975-01-008-4902
NSN 5920-01-643-5886
NSN 2925-01-583-5619