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
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Austria 
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Brazil 
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France 
Germany 
Republic of Korea 
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Italy 
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NATO Maintenance and Supply Agency Classification: Washers other than lock washers, iron or steel
NSN 6110-00-831-3727
NSN 5996-00-578-9092
NSN 5965-00-583-4865
NSN 5910-01-127-4475
NSN 6220-01-119-0742
NSN 5960-01-595-6515
NSN 5990-01-429-6211
NSN 5925-01-469-6667
NSN 5855-01-132-5139
NSN 5895-01-171-7250
NSN 6135-01-643-3114
NSN 5905-01-154-1122