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 5935-01-413-6368
NSN 5905-01-420-6319
NSN 5915-01-650-5377
NSN 6620-01-492-8470
NSN 4140-01-209-8456
NSN 5999-01-527-3852
NSN 5925-00-466-1189
NSN 5945-01-485-1263
NSN 5915-01-160-8175
NSN 5925-01-162-5741
NSN 5855-01-184-8089
NSN 6110-01-633-9660