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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Poland 
Romania 
Bulgaria 
Brazil 
Spain 
Columbia 
Israel 
Singapore 
Kuwait 
Morocco 
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Malaysia 
Thailand 
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New Zealand 
France 
Germany 
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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 6135-01-196-7399
NSN 5920-01-200-0683
NSN 6320-01-425-1417
NSN 6145-00-517-6666
NSN 5910-00-477-6699
NSN 5950-00-921-6452
NSN 6620-01-643-6817
NSN 7035-01-364-8454
NSN 6110-01-115-3871
NSN 6105-01-143-1332
NSN 6240-00-243-8336
NSN 5950-00-431-4064