The Simpson Strong-Tie Strong-Drive® SD and SDS structural-connector screws are the only screws approved for use with Simpson Strong-Tie connectors. Simpson Strong-Drive SD9112 #9 x 1-1/2" structural connector screws are approved to replace nails in certain Simpson Strong-Tie Connectors. The advantages of using screws can be ease of installation in tight spots and less vibration when installing connectors during remodel projects. The shank of the SD9112 screws are designed to easily fit in the holes of Strong-Tie connectors. Because the SD screws feature a mechanically galvanized coating they can be used in both interior and exterior applications.Screw Length: 1-1/2" Shank Size: .131" Thread Length: 1" Head Size: 1/4" Drive SD9112 Additional Information and Data Load Adjustment Factors for Optional Fasteners Used with Face Mount Hangers and Straight StrapsMechanical Galvanized (Class 55) Coating Information These Mechanically Galvanized coated fasteners possess a level of corrosion resistance that makes them suitable for use in some exterior and corrosive environments and with some preservative-treated woods. Mechanically-applied zinc in accordance with ASTM B695, Class 55 with a supplementary overcoat. Mechanically galvanized, Class 55 Mechanically galvanized screws are in compliance with the 2006, 2009, and 2012 International Residential Code.Level of Corrosion Resistance: Medium Additional Simpson Strong-Tie Information If there are any items on the Simpson Strong-Tie Website that you do not see on the DHC Supplies website we will gladly special order them. Most special order Simpson items ship the same or next business day. Call us at 800-323-2999 for pricing and availability. Important: Selecting USPS as a shipping method for any Simpson Strong-Tie product may delay shipping 1-2 days. Additionally, international shipments may also be delayed 1-2 days.Possible Free Shipping! Orders (Continental USA Only) of Simpson Strong-Tie items only that total $1850.00 or more may ship free depending on location, type of business and the type of Simpson products required. Additional products will be charged standard shipping if applicable. Please call 800-323-2999 to see if your order qualifies.