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 6105-00-331-7680
NSN 6135-01-223-3869
NSN 5965-01-462-1800
NSN 5985-01-273-6768
NSN 4140-01-369-2959
NSN 7035-01-100-9295
NSN 6110-00-431-6898
NSN 5945-01-407-8703
NSN 2925-01-387-0870
NSN 2925-00-413-2064
NSN 7035-01-633-9537
NSN 5950-00-765-1235