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 
U.s. Marine Corps 
Dept. of the Navy 
U.s. Coast Guard 
National Aeronautics and Space Administration 
Austria 
Finland 
Slovenia 
Poland 
Slovakia 
Bulgaria 
Czech Republic 
Brazil 
Spain 
Columbia 
Singapore 
Kuwait 
Saudi Arabia 
Malaysia 
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: Cotters, cotter-pins, washers and similar articles, of aluminum
NSN 5855-01-485-3429
NSN 5999-01-417-2123
NSN 5855-00-237-4088
NSN 5935-01-391-2535
NSN 5925-01-530-9122
NSN 5945-01-595-6691
NSN 5910-01-473-2485
NSN 5960-00-124-3928
NSN 5965-00-653-4782
NSN 5996-01-643-7157
NSN 6145-00-171-3152
NSN 6110-01-243-2989