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 
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Romania 
Bulgaria 
Brazil 
Spain 
Columbia 
Israel 
Singapore 
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Morocco 
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Malaysia 
Thailand 
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France 
Germany 
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Greece 
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NATO Maintenance and Supply Agency Classification: Washers other than lock washers, iron or steel
NSN 6105-01-584-3987
NSN 6105-01-351-7234
NSN 5910-00-726-4695
NSN 6110-01-200-2694
NSN 6685-01-352-7241
NSN 6320-01-233-5798
NSN 6105-01-491-5001
NSN 6105-00-246-5311
NSN 5945-01-618-1070
NSN 6610-01-555-8364
NSN 5935-01-391-0390
NSN 5999-00-074-0544