Nucor Fastener is a leading manufacturer of Structural Bolts in diameters ranging from 1/2" to 1-1/4" and metric equivalents. They use only domestically melted and rolled material and produce the bolts in St. Joe, Indiana, U.S.A. Nucor Structural Bolts are formed on precision high speed cold formers, utilizing in-process quality systems to ensure you receive the highest quality structural bolts available.