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 7035-01-522-5597
NSN 6650-00-776-7200
NSN 5935-00-263-7868
NSN 5999-01-590-1341
NSN 5835-01-244-8532
NSN 6145-00-448-1636
NSN 5895-01-004-5565
NSN 6150-00-291-6847
NSN 5915-01-391-4664
NSN 5975-01-462-5846
NSN 5895-01-248-4416
NSN 6650-01-215-9209