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.. Drive Style: Hex. Fastener Color: Silver. Fastener Material: Carbon Steel. Fastener Plating: Uncoated. Fastener Type: Wood Screw. Features: ACQ Rated. Grade: Not Graded. Head Style: Hex Head. Included: Driver Bit. Interior/Exterior: Exterior,Interior. Measurement Standard: SAE. Measurement System: Inches. Package Quantity: 100. Product Weight (lb.): 0.9 lb. Returnable: 90-Day. Thread Pitch (mm): 3 mm. Thread Style: Serrated Thread. Threads Per Inch (TPI): 8 TPI. Screw Length: 1-1/2 in. Size: #9. Screw Length: 1-1/2 in. Head Style: Hex Head. Fastener Material: Carbon Steel. Fastener Type: Wood Screw. Package Quantity: 100. Size: #9. Drive Style: Hex. Interior/Exterior: Exterior