This is a genuine manufacturer-sourced part which is specially designed for use with Murray, Snapper and Simplicity lawn and garden equipment. A lock nut is a type of nut that resists loosening when properly threaded onto a bolt. This is standard hardware which may have multiple applications, please make sure to refer to the appropriate d...Read moreiagrams of your model for the correct location and application of this hardware. Keep in mind this high-quality nut is made of durable metal and is sold individually.