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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Turkey Classification: Gaskets,washers & other seals
NSN 6620-01-135-0090
NSN 5935-01-141-6715
NSN 6220-01-293-2628
NSN 2925-01-430-4206
NSN 5998-01-371-2844
NSN 6320-00-036-3688
NSN 7035-01-041-2754
NSN 6610-01-437-2506
NSN 5835-00-466-3075
NSN 5925-01-222-1261
NSN 6220-01-327-3272
NSN 5920-00-678-7467