300 Series Stainless Steel or 17-4 Stainless Steel thru hardened to C36-C42
Often used with a hex nut. Provides larger bearing surface than washer face of nut
The standard Flat Washer used in the Tool & Die industry. These Flat Washers are thicker than standard washers. All of these washers are produced in the USA. Depending on the size, they are stamped or machined.