Enhance the security of your fastening applications with our Internal Tooth Lockwasher. Made of durable 410 Stainless Steel, this essential hardware component features a precise outside diameter of .6 inches and a thickness of .031 inches. Its internal diameter of .326 inches and hole size of 5/16 inches ensure a snug fit for your fasteners. Compliant with RoHS standards, this lockwasher guarantees both performance and environmental responsibility. Upgrade your assembly process with this reliable and high-quality locking solution.