Quick Overview

ClarkDietrich cold-formed C-studs, produced to ASTM C955 standards, for axial load-bearing and curtain-wall framing are pre-punched with knockouts at regular intervals—specifically designed to allow for rapid installation of pipes, electrical conduit and wall bridging. Standard knockout sizing is 1-1/2" x 4" in members 3-5/8" and wider. Members smaller than 3-5/8" are unpunched unless otherwise specified at time of order. If specified, members will be punched with a 3/4" x 2-1/2" knockout. Custom hole placement is available upon request. Knockouts are punched 12" from the lead edge with additional knockouts every 24" O.C. (in the west, the first knockout is punched 24" from the lead edge).