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 6130-00-187-0211
NSN 6150-01-583-7373
NSN 6240-01-332-6892
NSN 6135-01-255-9129
NSN 5905-01-014-0178
NSN 5895-01-426-8942
NSN 6620-01-464-3087
NSN 5945-01-143-1021
NSN 5910-00-185-5742
NSN 6240-00-284-1457
NSN 6130-01-025-3815
NSN 5998-01-005-9913