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 5965-01-199-4242
NSN 5965-01-444-3098
NSN 6650-01-420-7388
NSN 5835-01-015-0845
NSN 5925-00-156-4044
NSN 5855-01-007-9541
NSN 6150-01-148-2742
NSN 5905-00-290-8098
NSN 6220-00-969-2053
NSN 6220-00-576-3960
NSN 6150-00-146-3746
NSN 5855-01-483-1350