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 
New Zealand 
Turkey Classification: Washers other than lock washers, iron or steel
NSN 6620-01-550-2805
NSN 5950-01-406-2849
NSN 5999-01-184-4309
NSN 5895-01-087-8298
NSN 6240-01-298-9911
NSN 6240-01-285-5688
NSN 6105-01-512-8752
NSN 6220-01-190-8605
NSN 6620-00-694-8273
NSN 5950-01-025-6732
NSN 5950-00-669-5873
NSN 6135-01-576-8491