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 Navy 
Italy 
Turkey Classification: Gaskets, washers and other seals, of vulcanized rubber other than hard rubber
NSN 5998-01-595-9291
NSN 6650-01-102-7847
NSN 5996-01-418-2802
NSN 5925-01-651-3059
NSN 6135-01-026-9960
NSN 6150-01-360-3749
NSN 5985-00-631-6672
NSN 6110-01-013-0551
NSN 5960-00-266-6741
NSN 6135-01-394-4160
NSN 5998-01-384-9771
NSN 5930-00-800-7435