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 6110-00-421-1650
NSN 5999-01-537-9231
NSN 5930-00-397-0381
NSN 7035-01-315-9754
NSN 6240-00-879-5830
NSN 6145-01-581-8493
NSN 6620-01-628-2620
NSN 6145-01-113-2337
NSN 5999-00-422-5468
NSN 5999-01-361-6283
NSN 5985-01-163-5239
NSN 5950-01-122-0155