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 5910-01-578-6247
NSN 6650-01-390-6989
NSN 6145-01-370-4317
NSN 6145-00-293-5097
NSN 5930-01-400-6126
NSN 6105-01-510-5312
NSN 7035-01-461-4634
NSN 5960-00-553-7338
NSN 7035-01-068-3300
NSN 5945-01-006-2311
NSN 6145-01-449-9796
NSN 5998-00-893-2466