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 Air Force 
Defense Threat Reduction Agency 
Dept. of the Navy 
Singapore NSN 6110-00-625-8643
NSN 5960-01-135-5419
NSN 6150-01-123-3044
NSN 5905-01-590-3028
NSN 5965-01-390-1261
NSN 5945-01-528-8018
NSN 6145-01-587-1263
NSN 6240-01-442-5114
NSN 5945-01-634-0588
NSN 6105-01-579-4547
NSN 5950-01-634-0677
NSN 5965-01-185-0295