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 5975-01-584-3787
NSN 6645-01-324-0348
NSN 5910-01-211-1479
NSN 6610-01-472-9219
NSN 6130-01-644-0992
NSN 5950-01-533-2125
NSN 5920-01-559-7554
NSN 5930-01-303-8044
NSN 7035-01-182-1086
NSN 6130-01-394-8785
NSN 6145-01-498-6499
NSN 6135-01-421-7168