Flange bolts are those type of bolts having a ridge or skirt around the bolt head. This flange bolt is cold formed from round steel wire using a four-blow progression on a high speed cold header. A hex flange bolt is a bolt that has a washer-like flange cast into the hexagonal head of the bolt. Designed to be used without the aid of a flat or locking-style washer, the flange hex bolt is manufactured to properly displace the torque and clamping force of the bolt over a wider area than that of a typical hex head bolt. Used a great deal in the automobile industry, this type of bolt allows assembly line workers to install the fasteners much faster than a comparable bolt and washer.