Lock nuts are a type of fastener that features a built-in mechanism to prevent accidental loosening or unscrewing. They are used to secure critical components in various applications, including automotive, aviation, and manufacturing industries. Lock nuts typically have a distinct shape, with a small collar or flange that creates a frictional force to hold the nut in place. Additionally, some lock nuts may feature a nylon insert or a serrated surface for added grip and security. These safety features help to prevent accidents and maintain the integrity of the machinery or equipment.