For 12 screw size
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.
Classification: Washers other than lock washers, iron or steel
NSN 4140-01-437-0955
NSN 5985-00-798-4817
NSN 5996-01-032-1238
NSN 5990-01-472-2447
NSN 6220-01-352-1643
NSN 5985-00-242-5034
NSN 6110-01-573-9697
NSN 5985-01-200-3545
NSN 5935-00-065-9703
NSN 5998-01-587-3948
NSN 6620-01-517-0014
NSN 6135-00-754-8191