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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Lithuania 
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Poland 
Romania 
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Brazil 
Spain 
Columbia 
Israel 
Singapore 
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Morocco 
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Malaysia 
Thailand 
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France 
Germany 
Republic of Korea 
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Greece 
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NATO Maintenance and Supply Agency Classification: Washers other than lock washers, iron or steel
NSN 5895-00-455-0248
NSN 6105-01-575-0069
NSN 6645-00-806-6961
NSN 2925-00-038-0596
NSN 5945-01-013-0045
NSN 5999-01-335-5428
NSN 5999-00-859-3410
NSN 5998-01-044-2035
NSN 5975-00-941-8350
NSN 6320-01-206-8930
NSN 5835-01-122-9657
NSN 5999-01-391-8822