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.
Dept. of the Army 
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U.s. Marine Corps 
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National Aeronautics and Space Administration
National Aeronautics and Space Administration 
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Poland 
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 5855-01-657-7657
NSN 5999-01-203-1880
NSN 5990-01-102-9617
NSN 6240-01-312-9158
NSN 5895-01-311-3008
NSN 6610-00-166-0233
NSN 5905-01-512-8684
NSN 5950-00-948-7733
NSN 6110-01-131-8404
NSN 5930-00-280-2562
NSN 6645-01-005-8622
NSN 5935-00-851-5112