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 
Spain 
Republic of Korea 
Italy 
Greece 
Turkey Classification: Copper washers including spring washers not threaded
NSN 5996-00-248-7061
NSN 5945-01-351-5354
NSN 5930-01-098-4447
NSN 5945-00-534-3599
NSN 6220-01-406-3167
NSN 6320-01-050-1290
NSN 5925-01-114-0909
NSN 6130-01-359-7853
NSN 5935-01-022-9640
NSN 6320-01-631-7828
NSN 5935-01-493-5164
NSN 5975-01-398-8956