Simpson SD10212R100-R Strong-Drive? SD CONNECTOR Screw ? #10 x 2-1/2 in. 1/4-Hex Drive, Mech. Galv. (100-Qty) The Strong-Drive SD Connector screw is specifically designed to replace nails in certain Simpson Strong-Tie connectors and is the only screw approved for that application. The load-rated SD screw has been tested and approved for use in many popular Simpson Strong-Tie products. In certain applications screws are easier and more convenient to install than nails, and the single-fastener load values achieved by the SD screw exceed those of typical 10d common or 16d common nails. In addition, the galvanized coating makes the SD screw ideal for interior and most exterior conditions. Features Tested and approved for use in many of Simpson Strong-Tie's best-selling connectors for both interior and most exterior applications. Ideal for use in connector applications where more control is desired or using a hammer is inconvenient 1/4-in. hex head with 0.37-in. diameter integrated washer reduces cam-out and is stamped with the Simpson Strong-Tie "?" sign and the fastener size for easy identification after installation. Shank is specifically designed to match the fastener holes in Simpson Strong-Tie connectors Optimized heat treating for ductility and strength. Size: #10 x 2-1/2 in. Hex driver included. Mechanically galvanized, Class 55 coating meets the requirements for use in preservative-treated and fire-retardant-treated wood per the 2012 and 215 IRC Quantity: 100. USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.