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 6650-01-555-8819
NSN 6145-01-236-6251
NSN 6650-00-061-2232
NSN 6150-01-475-7764
NSN 5965-00-866-3371
NSN 5835-01-045-6371
NSN 6110-01-361-8949
NSN 5950-01-217-9301
NSN 5998-01-425-9863
NSN 5965-01-553-4970
NSN 5985-01-605-0230
NSN 6645-01-446-1994