Ensure optimal fastening with this External Tooth Lock Washer. Crafted from durable steel with a protective zinc coating, it offers reliable performance in various applications. Measuring .501 inches in outside diameter and .025 inches in thickness, it is designed to fit snugly with a 1/4-inch hole size. The external teeth provide a secure grip, preventing loosening over time. With a compliance to ASME B18.21.1 standards and RoHS certification, this washer guarantees both quality and environmental responsibility. Upgrade your fastening system with this essential component.