Hillman Split Lock Washer 1/4 is designed to provide a secure locking feature by using its circular bearing surface with offset split ends that bite into the mating material when tightened beneath a nut. This round washer, featuring a hole in the center, is i for applications where loosening due to corrosion or vibration is a concern. It is commonly used in any situation where a bolt is drawing two pieces together, ensuring a reliable hold and preventing loosening over time. Model Number: