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 Aeronautics and Space Administration
National Aeronautics and Space Administration 
Austria 
Finland 
Poland 
Czech Republic 
Brazil 
Spain 
Columbia 
Israel 
Singapore 
Kuwait 
Morocco 
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Malaysia 
Thailand 
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Belgium 
Canada 
South Africa 
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 2925-00-707-6770
NSN 6105-01-141-7727
NSN 6145-00-284-1514
NSN 6645-00-975-6941
NSN 6145-00-653-2448
NSN 5999-00-409-9491
NSN 6135-00-196-5267
NSN 6320-01-630-7629
NSN 5935-01-171-7093
NSN 5930-01-067-1355
NSN 6150-01-245-5337
NSN 5945-01-068-1050