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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U.s. Coast Guard 
Finland 
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Romania 
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Brazil 
Spain 
Columbia 
Singapore 
Kuwait 
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Australia 
Belgium 
Canada 
New Zealand 
France 
Germany 
Republic of Korea 
United Kingdom 
Netherlands 
Portugal 
Italy 
Denmark 
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Greece 
Turkey 
NATO Maintenance and Supply Agency Classification: Washers other than lock washers, iron or steel
NSN 6105-01-283-0852
NSN 5975-01-130-8501
NSN 6620-01-205-4815
NSN 6620-00-209-0767
NSN 6320-00-024-1004
NSN 6220-01-069-3685
NSN 6110-00-256-6614
NSN 5920-01-154-6208
NSN 7035-01-476-1709
NSN 5945-01-076-8518
NSN 5965-01-026-1125
NSN 5965-01-633-8849