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 6130-01-525-4573
NSN 5990-01-492-6575
NSN 5990-00-893-8998
NSN 6610-01-056-7499
NSN 6110-01-423-9193
NSN 5960-01-238-7367
NSN 5835-01-493-1826
NSN 7035-01-003-9142
NSN 6105-01-615-2328
NSN 6135-01-584-0941
NSN 6135-01-312-1040
NSN 2925-01-589-4880