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 6645-01-166-8904
NSN 5985-00-818-7105
NSN 5990-01-116-2181
NSN 2925-00-549-6759
NSN 6620-01-519-2628
NSN 6685-00-762-5476
NSN 5950-00-980-3830
NSN 5950-00-900-7638
NSN 5920-00-522-4233
NSN 5905-01-170-2770
NSN 6220-01-398-7212
NSN 7035-01-550-9760