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 2925-00-275-1807
NSN 5945-01-100-1873
NSN 5915-01-111-9052
NSN 6105-01-461-2347
NSN 5905-01-534-4708
NSN 5915-00-222-6031
NSN 5998-01-270-0035
NSN 5925-01-385-2875
NSN 5999-01-194-9899
NSN 6240-01-208-0401
NSN 5915-01-646-0331
NSN 5999-01-046-0151