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 5855-01-023-3727
NSN 6685-01-422-4241
NSN 5998-00-851-1883
NSN 5930-01-612-1015
NSN 5998-00-163-9742
NSN 5960-01-167-8796
NSN 5985-01-534-9915
NSN 5965-01-431-8060
NSN 5895-00-008-5256
NSN 5930-00-398-1517
NSN 5835-01-477-8903
NSN 5920-01-630-7299