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 5855-00-151-3853
NSN 6130-01-396-7349
NSN 5930-01-380-8243
NSN 5930-01-147-9440
NSN 5996-01-303-4630
NSN 7035-01-131-1168
NSN 5925-01-148-4866
NSN 5930-01-512-0745
NSN 6240-00-187-4306
NSN 6645-01-587-4642
NSN 6320-01-346-5158
NSN 6135-01-327-1293