Flange bolts have a circular flange under the head that acts like a washer to distribute the load.Hex flange bolts are one-piece head bolts that are flat surfaced.
This serves to distribute the pressure of the bolt over the part being secured, reducing the chance of damage to the part and making it less likely to loosen as a result of an uneven fastening surface. These bolt are mostly hexagonal in shape and are made up of hardened steel and often coated with zinc.
Flange bolts are widely used in automobiles and electronic products.