Introducing the Hex Serrated Flange Lock Nut by POWERTEC This essential lock nut delivers a solid, non-rotating, locking hold on your work piece, even in your high vibration applications. Featuring a precision serrated flange, acting as an integrated washer, that evenly distributes the pressure on a wider area of your stock to ensure optimal fastening. Great for use when attaching uneven mating surfaces, or when the installation hole is over-sized or poorly aligned. Great for a wide variety of attachment applications, from all purpose to heavy duty. Constructed of durable steel for lasting use and zinc-plated for wear resistance. Whether you re a professional or DIY r, you can t go wrong with this pack of high-performing nuts. Strong connections make for perfect projects. Zinc-plated steel build for durability and wear resistance Promotes non-rotating solid connections in your projects Serrated profile of the flange evenly distributes torque Provides solid fastening even in high-vibration environments Won t loosen even in heavy-duty applications Handy 25PK/ Size: 1/4 -20 POWERTEC is a leading manufacturer of high quality measurement equipment, hand tools, woodworking machines, gear, and accessories. They are committed to exceeding expectations, while bringing the latest innovation, technology, and product development to the industry.