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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National Security Agency 
U.s. Marine Corps 
Dept. of the Navy 
Austria 
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Turkey Classification: Gaskets,washers & other seals
NSN 6610-01-370-3886
NSN 6150-00-223-9761
NSN 5945-01-464-0859
NSN 5935-00-127-0120
NSN 7035-00-763-6180
NSN 5935-00-199-6693
NSN 5835-01-439-0180
NSN 6240-01-258-5829
NSN 2925-01-535-7235
NSN 7035-01-500-5640
NSN 5915-01-486-7138
NSN 5996-01-009-0428