The Flange bolt or screw is identifiable by the ridge of the bolt head. The bolt’s circular flange under the head that acts like a washer to distribute the load and is designed to provide the same holding power as a washer. Browse our selection of hex head serrated flange screws, indented hex flange screws, and non-serrated hex flange screws. Order online for your next industrial or commercial project or request a quote. Don't forget you can always contact us at 866-463-2910. Shop Online Below!