Ensure optimal fastening with our Internal Tooth Lockwasher. Crafted from durable 316 Stainless Steel, this essential component guarantees secure attachment in a variety of applications. With an outside diameter of .682 inches and a thickness of .036 inches, it provides reliable reinforcement. The precise inside diameter of .391 inches and hole size of 3/8 inch offer a perfect fit for your fastening needs. Rest assured, this lockwasher is RoHS compliant, meeting strict environmental standards. Trust in its quality to keep your assemblies firmly in place.