This External Tooth Lock Washer is designed for secure fastening applications, ensuring optimal grip and preventing loosening under vibration. Made of durable 410 Stainless Steel, it offers reliable corrosion resistance and longevity. With an ASME B18.21.1 specification, it meets high-quality standards for industrial use. The washer features an outside diameter of .252 inches and a thickness of .015 inches, suitable for #4 hole sizes. Its precise design with an inside diameter of .119 inches guarantees a snug fit, enhancing the efficiency of fastening operations. RoHS compliance further underscores its environmental responsibility. Trust this washer to provide essential locking functionality in various assemblies, maintaining the integrity of your equipment.