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 5996-01-383-7018
NSN 2925-01-279-1558
NSN 5895-01-406-9355
NSN 5985-01-274-7936
NSN 5950-01-528-3030
NSN 2925-00-051-1467
NSN 5895-01-529-5404
NSN 5930-01-576-4484
NSN 6145-01-399-0467
NSN 6645-01-281-7254
NSN 2925-01-159-0506
NSN 5960-00-340-3120