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.
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National Aeronautics and Space Administration
National Aeronautics and Space Administration 
Sweden 
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Lithuania 
Slovenia 
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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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 6145-01-406-5051
NSN 5945-00-914-4413
NSN 5915-01-182-7487
NSN 5855-01-031-4729
NSN 5895-01-046-2001
NSN 6610-01-529-8529
NSN 5920-01-294-2805
NSN 5990-01-232-6018
NSN 5960-01-141-7584
NSN 5935-01-422-3228
NSN 7035-01-487-3324
NSN 5910-01-283-7089