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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National Aeronautics and Space Administration
National Aeronautics and Space Administration 
Sweden 
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Romania 
Bulgaria 
Brazil 
Spain 
Columbia 
Israel 
Singapore 
Kuwait 
Morocco 
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Malaysia 
Thailand 
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France 
Germany 
Republic of Korea 
United Kingdom 
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Netherlands 
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Italy 
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Greece 
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NATO Maintenance and Supply Agency Classification: Washers other than lock washers, iron or steel
NSN 5925-01-590-2513
NSN 6645-01-228-9645
NSN 6130-00-254-8337
NSN 6110-00-138-5792
NSN 5960-01-654-4353
NSN 5835-01-416-6455
NSN 5990-00-736-8778
NSN 6620-00-970-2363
NSN 5965-01-068-2714
NSN 6130-00-643-4894
NSN 6110-01-365-3923
NSN 6620-00-789-1638