About Flange Bolts
Flange bolts have a circular flange under the head that acts like a washer to distribute the load. Flange bolts that are non-serrated are sometimes called frame bolts.
Flange Bolts Used in automotive applications, plumbing, and more, flange bolts feature a washer like flange beneath the bolt head that speeds production time and distributes the clamping load, offering protection to the mating surface.