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 
Spain 
Republic of Korea 
Greece 
Turkey Classification: Copper screws, nuts, bolts, rivets, and other fasteners not threaded
NSN 5930-01-445-5408
NSN 6220-01-241-4625
NSN 6620-01-383-7519
NSN 5930-01-617-1334
NSN 5925-01-039-0246
NSN 7035-01-065-4671
NSN 6620-01-595-0024
NSN 6685-01-557-8644
NSN 6620-01-102-0008
NSN 2925-01-516-0124
NSN 6645-01-065-7036
NSN 6105-01-481-0350