Weapon system essential
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 
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U.s. Marine Corps 
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Federal Aviation Administration 
U.s. Coast Guard 
National Weather Service 
National Aeronautics and Space Administration 
Austria 
Finland 
Hungary 
Lithuania 
Poland 
Brazil 
Spain 
Columbia 
Israel 
Singapore 
Kuwait 
Morocco 
Saudi Arabia 
Malaysia 
Australia 
Belgium 
Canada 
New Zealand 
France 
Germany 
Republic of Korea 
United Kingdom 
Netherlands 
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Denmark 
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NATO Maintenance and Supply Agency Classification: Washers other than lock washers, iron or steel
NSN 6320-01-442-3428
NSN 5996-01-054-2820
NSN 5996-01-346-1099
NSN 6150-01-025-8134
NSN 5950-00-203-5621
NSN 5950-01-068-3386
NSN 5960-00-078-9500
NSN 5999-00-624-4242
NSN 5855-01-429-8702
NSN 6320-00-391-5906
NSN 6240-01-500-2152
NSN 6130-01-117-0441