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 
Spain 
Greece 
Turkey Classification: Gaskets, washers and other seals, of vulcanized rubber other than hard rubber
NSN 6650-01-428-9958
NSN 6130-01-146-4590
NSN 5895-01-442-8459
NSN 5950-00-175-9765
NSN 4140-01-254-2739
NSN 4140-01-380-0324
NSN 5910-00-188-9085
NSN 6135-01-364-2738
NSN 5950-01-484-3352
NSN 5990-01-439-4643
NSN 6105-00-468-4008
NSN 5985-01-181-5627