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 
Defense Threat Reduction Agency 
U.s. Marine Corps 
Dept. of the Navy 
U.s. Coast Guard 
National Aeronautics and Space Administration 
Austria 
Finland 
Lithuania 
Slovenia 
Poland 
U.s. Postal Service - Procurement and Supplies Dept. 
Brazil 
Spain 
Singapore 
Kuwait 
Morocco 
Saudi Arabia 
Malaysia 
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 6240-01-123-8822
NSN 5915-01-542-7436
NSN 6320-01-516-3836
NSN 5998-01-045-7927
NSN 5960-01-394-0750
NSN 6620-00-148-9613
NSN 6685-00-186-0190
NSN 6220-01-146-9351
NSN 6105-01-445-6130
NSN 6240-00-102-4003
NSN 5910-01-399-4566
NSN 5998-01-500-2021