Simpson Structural Screws Available SD9112R100 No.9 by 1-1/2-Inch Structural-Connector Screw, 100-Pack 1/4-Inch Hex Head drive reduces cam-out for easier installation Shank is specifically designed to match the fastener holes in Simpson Strong-Tie connectors Optimized heat treated for strength Mechanically-galvanized coating meets ASTM B695 class 55 Connectors installed with SD screw code listed under ICC-ES ESR-3096