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 
Austria 
Greece Classification: Copper washers including spring washers not threaded
NSN 2925-01-144-7106
NSN 6645-01-464-8538
NSN 7035-00-153-3826
NSN 7035-00-946-2642
NSN 5835-01-035-2976
NSN 6220-01-604-3308
NSN 5920-01-025-9381
NSN 6620-00-827-1611
NSN 5965-01-428-3348
NSN 5835-01-482-1591
NSN 5925-01-239-4414
NSN 6135-01-101-5039