Hillman Split Lock Washer #8 is designed to provide a secure locking feature by using a circular bearing surface with offset split ends that bite into the mating material when tightened beneath a nut. This round washer with 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 draws two pieces together, ensuring a reliable and tight connection. Model Number: