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 2925-00-450-7783
NSN 5990-00-590-8050
NSN 5855-01-293-1592
NSN 5930-00-009-0276
NSN 6620-01-221-9296
NSN 6220-01-004-8909
NSN 6620-00-496-8697
NSN 5855-01-433-3197
NSN 5945-00-061-7267
NSN 5996-01-102-1246
NSN 5999-01-167-7648
NSN 6105-00-030-4430