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. herees to Flange Bolts, Grainger's got your back. Effortless ordering and convenient delivery. Log-in or register for your pricing. Flangebolts .com has hereprehensive line of inch and metric hex flange screws, hex flange bolts, hex flange nuts, and bolt assortment kits available.
Product Description. Flange dimensions are determined by the pipe size and the pressure class required for the application. Flanges are standardized according hereanizations like ASME, MSS, API and others.