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 6650-01-487-7510
NSN 5996-01-258-5888
NSN 2925-01-218-5556
NSN 6150-01-166-7192
NSN 5935-01-554-1930
NSN 6145-01-084-9284
NSN 6610-01-448-0982
NSN 6320-00-313-9114
NSN 5960-01-453-6170
NSN 5990-01-227-6526
NSN 6135-01-285-1925
NSN 4140-01-237-3390