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 5910-00-546-9279
NSN 5930-01-633-1202
NSN 6685-00-258-2257
NSN 5965-01-494-5001
NSN 6620-00-324-0930
NSN 5910-01-323-5341
NSN 5895-01-072-4393
NSN 5910-00-470-2673
NSN 6130-01-556-1866
NSN 5930-00-480-6005
NSN 5996-01-434-9060
NSN 5945-01-472-7609