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 6105-01-255-9970
NSN 5960-01-369-8666
NSN 6645-01-163-9930
NSN 5965-01-096-7825
NSN 5950-01-396-6956
NSN 6145-00-596-8447
NSN 2925-01-372-9455
NSN 5920-00-905-4769
NSN 6130-01-460-7575
NSN 6685-01-166-6593
NSN 6685-00-469-2550
NSN 5975-01-302-6335