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 Security Agency 
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Dept. of the Navy 
Bureau of Prisons 
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U.s. Coast Guard 
National Aeronautics and Space Administration
National Aeronautics and Space Administration 
Poland 
Brazil 
Spain 
Singapore 
Kuwait 
Malaysia 
Australia 
Belgium 
Canada 
New Zealand 
France 
Germany 
Republic of Korea 
United Kingdom 
Netherlands 
Portugal 
Denmark 
Greece 
Turkey 
NATO Maintenance and Supply Agency Classification: Washers other than lock washers, iron or steel
NSN 6135-00-951-3426
NSN 5935-00-336-8606
NSN 5998-01-520-4252
NSN 6220-00-420-4364
NSN 6240-01-421-9388
NSN 6105-01-476-5374
NSN 5990-01-225-2283
NSN 6320-01-046-5228
NSN 6240-00-978-9752
NSN 5945-01-270-1104
NSN 6110-01-386-1536
NSN 6240-01-198-1966