The Briggs & Stratton 703348 is a genuine OEM 7/16-20 hex center lock nut. It is a standard hardware component used across a variety of outdoor power equipment to secure critical parts that must withstand vibration and high mechanical stress. Genuine OEM Options The Briggs & Stratton 703348 Nut is the factory-original hardware. Because this is a center lock nut, it is designed with a specialized thread that creates resistance to prevent it from loosening due to engine vibrations. It is commonly found on lawn mowers, tractors, edgers, and trimmers.