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 6135-01-222-0703
NSN 5910-00-016-7148
NSN 5990-01-076-8901
NSN 6135-00-269-5843
NSN 5950-00-960-0120
NSN 6650-01-594-9915
NSN 5960-01-027-4927
NSN 5950-01-080-8557
NSN 5990-01-160-6978
NSN 6110-00-167-7522
NSN 6105-01-076-3844
NSN 6620-01-412-5514