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 6685-01-443-3575
NSN 5905-01-088-7258
NSN 5895-01-226-5088
NSN 4140-01-631-8844
NSN 6135-00-752-1589
NSN 6220-01-104-7803
NSN 5895-00-590-8726
NSN 5999-01-386-5327
NSN 6620-01-430-7104
NSN 5925-01-401-5314
NSN 7035-00-420-1310
NSN 5905-01-432-0872