A washer having a centrally located hole with a solid or laminated cross-section and two flat parallel bearing surfaces. The hole must be 75 percent or less than the largest dimension and the bearing surface finish is greater than 32 microinch (0.8 micrometer). The thickness cannot exceed 25 percent of the largest outside dimension. When the largest outside dimension is less than 1/4 inch or 6mm, the thickness must be 0.006 inches (0.15mm) or greater and for items 1/4 inch (6mm) or larger, the thickness must be 0.016 inches (0.4mm) or greater. The maximum tolerance is applied to dimensions and used as a determining factor. Items with separable lamination use shim. For items fabricated from ceramic or electrically rated materials by specification or industry standards use insulator (1), washer. Excludes disk, valve, graphite impregnated and lubricated items.
Dept. of the Army 
Dept. of the Air Force 
National Security Agency 
U.s. Marine Corps 
Dept. of the Navy 
U.s. Coast Guard 
National Aeronautics and Space Administration 
Austria 
Poland 
Brazil 
Spain 
Singapore 
Morocco 
Thailand 
Australia 
Belgium 
Canada 
New Zealand 
France 
Germany 
Republic of Korea 
United Kingdom 
Netherlands 
Portugal 
Italy 
Denmark 
Norway 
Greece 
Turkey 
NATO Maintenance and Supply Agency Classification: Washers other than lock washers, iron or steel
NSN 6220-00-612-8073
NSN 5855-01-406-4821
NSN 6645-00-907-8584
NSN 6685-00-198-9506
NSN 6135-01-282-4326
NSN 6650-01-055-3527
NSN 5985-00-578-7740
NSN 5945-01-627-7048
NSN 5950-00-139-6662
NSN 6105-01-206-4972
NSN 5930-00-388-0161
NSN 6650-00-961-9686