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 
Republic of Korea 
Italy 
Greece 
Turkey Classification: Copper washers including spring washers not threaded
NSN 5930-01-367-7589
NSN 5985-01-320-2846
NSN 5975-01-660-7634
NSN 5965-01-112-8758
NSN 5965-01-625-1006
NSN 6240-01-211-4507
NSN 5985-01-300-0481
NSN 5920-00-779-9560
NSN 6110-01-439-5852
NSN 6130-01-200-5683
NSN 5999-01-052-5566
NSN 6650-01-089-7777