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 Air Force 
Dept. of the Navy Classification: Washers other than lock washers, iron or steel
NSN 5950-01-587-9103
NSN 5965-01-569-3332
NSN 6135-01-180-9611
NSN 4140-01-429-8545
NSN 5950-01-295-7257
NSN 6620-01-523-0713
NSN 6645-01-656-6416
NSN 6150-01-450-6537
NSN 7035-01-090-3369
NSN 2925-01-464-3093
NSN 5999-01-195-4031
NSN 5965-01-262-9608