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 
U.s. Marine Corps 
Dept. of the Navy NSN 4140-01-455-5170
NSN 6135-01-303-0295
NSN 5960-01-500-6615
NSN 6220-01-430-0171
NSN 5990-00-557-8726
NSN 6610-01-123-2276
NSN 6650-01-127-9518
NSN 4140-01-003-9850
NSN 5935-00-246-3898
NSN 5920-01-479-0284
NSN 5925-01-359-5440
NSN 7035-01-236-5743