This Internal Tooth Lockwasher is designed to provide secure fastening in #6 hole sizes, featuring a durable steel construction with a protective zinc finish coating. With an outside diameter of .312 inches and a thickness of .02 inches, it offers reliable locking functionality. Its internal tooth design ensures a tight grip, making it ideal for various applications where vibration and movement need to be minimized. The inside diameter of .146 inches allows for precise fitting, guaranteeing effective performance. Non-RoHS compliant.