Item is for (5/16) equals 0.312 inches 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 6240-01-562-2012
NSN 6240-01-605-1799
NSN 5910-00-421-8346
NSN 5965-00-324-2428
NSN 5855-00-411-8688
NSN 5915-01-100-8523
NSN 5975-01-195-0239
NSN 5975-00-271-0420
NSN 6610-00-441-7243
NSN 5998-01-213-2321
NSN 6610-01-387-5630
NSN 5905-01-359-1372