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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National Weather Service 
National Aeronautics and Space Administration
National Aeronautics and Space Administration
National Aeronautics and Space Administration 
Austria 
Finland 
Poland 
Bulgaria 
Brazil 
Spain 
Columbia 
Israel 
Singapore 
Kuwait 
Morocco 
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Malaysia 
Australia 
Belgium 
Canada 
New Zealand 
France 
Germany 
Republic of Korea 
United Kingdom 
Netherlands 
Portugal 
Italy 
Denmark 
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Greece 
Turkey 
NATO Maintenance and Supply Agency Classification: Washers other than lock washers, iron or steel
NSN 5835-01-156-5622
NSN 5915-01-336-7669
NSN 5999-01-277-8260
NSN 6130-01-029-3601
NSN 5996-01-123-9038
NSN 6110-01-461-3612
NSN 6145-00-860-3475
NSN 6145-00-170-6872
NSN 5990-00-181-2220
NSN 5965-01-133-7459
NSN 5925-01-170-4150
NSN 5975-01-420-6902