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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U.s. Coast Guard 
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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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 5985-00-342-2508
NSN 5910-01-233-9776
NSN 5920-00-028-4339
NSN 5996-01-431-1524
NSN 5920-00-288-5849
NSN 6130-01-454-9116
NSN 5960-01-599-9821
NSN 5985-01-464-5041
NSN 5905-01-293-1405
NSN 5930-01-426-9130
NSN 5920-01-352-7223
NSN 6610-01-656-8198