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 6150-01-575-7169
NSN 6685-01-197-7064
NSN 6620-00-010-8190
NSN 5985-01-501-5908
NSN 6105-01-145-7276
NSN 6145-01-054-3874
NSN 5990-01-532-0670
NSN 5950-01-380-2283
NSN 2925-01-016-0876
NSN 6320-00-790-4844
NSN 5925-01-116-4439
NSN 6105-01-125-6498