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 5935-01-215-0824
NSN 6645-00-173-2800
NSN 5985-01-183-7180
NSN 6220-01-579-3138
NSN 5905-01-420-5365
NSN 5990-01-485-0260
NSN 6620-01-440-9810
NSN 5895-01-296-8843
NSN 6110-00-148-8536
NSN 2925-01-505-1666
NSN 6105-00-941-8351
NSN 6105-01-133-6941