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 
Austria 
Finland 
Poland 
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Brazil 
Spain 
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Israel 
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Malaysia 
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France 
Germany 
Republic of Korea 
United Kingdom 
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 2925-01-422-1542
NSN 5935-01-023-7662
NSN 6150-01-656-0447
NSN 5835-01-509-8992
NSN 5915-01-208-5051
NSN 6135-01-512-8740
NSN 6320-00-284-1524
NSN 5965-01-184-2477
NSN 5915-00-225-9506
NSN 5960-00-151-7576
NSN 4140-01-446-6007
NSN 5935-00-142-0423