Carbon Steel Flange Nut, Zinc Plated Finish, Grade 2, Self-Locking Serrated Flange, Right Hand Threads
A flange nut is a nut that has a wide flange at one end that acts as an integrated, non-spinning washer. This serves to distribute the pressure of the nut over the part being secured, reducing the chance of damage to the part and making it less likely to loosen