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 Army 
Dept. of the Navy 
Spain 
Republic of Korea NSN 7035-01-429-0431
NSN 5999-01-023-2790
NSN 5975-01-301-7486
NSN 6110-01-443-3279
NSN 5855-01-028-8387
NSN 6135-01-515-9626
NSN 6110-01-268-6215
NSN 5960-01-148-5214
NSN 6320-01-338-6006
NSN 5999-01-314-2362
NSN 4140-00-020-1835
NSN 5999-01-185-9636