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 5999-01-208-1765
NSN 6240-00-672-2759
NSN 5985-01-531-7372
NSN 4140-01-391-6070
NSN 5975-01-092-5713
NSN 6645-00-443-8011
NSN 5905-01-452-3310
NSN 6610-01-618-2158
NSN 6135-01-633-1691
NSN 5960-01-024-4443
NSN 5910-01-322-5964
NSN 5945-00-648-0552