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 5920-00-891-2771
NSN 5950-00-642-5951
NSN 5920-00-686-2587
NSN 6650-01-222-1749
NSN 6130-01-485-2464
NSN 5925-01-386-3139
NSN 5915-01-147-4830
NSN 6620-00-417-6285
NSN 6610-00-943-3136
NSN 6110-00-118-1260
NSN 6110-00-993-3352
NSN 6110-01-179-9696