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.
Canada 
New Zealand 
France Classification: Copper washers including spring washers not threaded
NSN 5996-01-265-3657
NSN 6135-01-472-9011
NSN 5975-01-061-9320
NSN 5920-00-359-9771
NSN 6150-00-462-0159
NSN 5998-01-143-7334
NSN 5975-01-352-2967
NSN 6320-01-393-7022
NSN 5965-00-957-5200
NSN 6240-01-521-7867
NSN 4140-01-409-1764
NSN 5990-01-641-0123