Simpson SDWS Timber Screw (Exterior Grade) 5/16"x4"

Simpson Strong-Tie Simpson SDWS Timber Screw (Exterior Grade) 5/16"x4"
Simpson Strong-Tie Simpson SDWS Timber Screw (Exterior Grade) 5/16"x4"
Simpson Strong-Tie Simpson SDWS Timber Screw (Exterior Grade) 5/16"x4"
Simpson Strong-Tie 50 Count Simpson SDWS Timber Screw (Exterior Grade) 5/16"x4"
Simpson Strong-Tie 12 Count Simpson SDWS Timber Screw (Exterior Grade) 5/16"x4"

Simpson SDWS Timber Screw (Exterior Grade) 5/16"x4"

Sale price $14.99
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Additional Railing Components


Introducing the Strong-Drive SDWS Timber Screw (Exterior Grade) - the ultimate solution for secure and hassle-free wood framing installations. This high-strength alternative to through-bolting and traditional lag screws is designed with both contractors and do-it-yourselfers in mind. With its outstanding features and code compliance, it ensures reliable performance and peace of mind.


  • SawTooth Point: The innovative SawTooth point allows for fast starts, reduces installation torque, and eliminates the need for predrilling in most applications. Say goodbye to time-consuming prep work and get the job done quickly.

  • Bold Thread Design: The bold thread design of the SDWS Timber Screw provides superior holding power, ensuring a secure and durable connection. Rest assured that your wood framing will stay firmly in place.

  • Underhead Nibs: Experience greater control when seating the head of the screw, thanks to the underhead nibs. This feature enhances precision during installation, giving you the confidence that the screw is properly seated.

  • Large Low-Profile Washer Head: The SDWS Timber Screw boasts a large low-profile washer head with a generous 0.75-inch diameter. This design maximizes the bearing area, distributing the load evenly for added strength and stability.

  • Size Identification: With size identification markings on all SDWS screw heads, you can easily identify the appropriate screw length for your specific application. No more guessing or searching through different screws.

  • 6-Lobe T40 Drive: The SDWS Timber Screw utilizes a 6-lobe T40 drive, providing positive engagement that makes driving the screw a breeze. This drive design also improves the lifespan of the driver bit (BIT40T-134-RC) for extended usability.


  • Length: 4 inches

  • Code Compliance: The SDWS Timber Screw is code listed under IAPMO UES ER-192 and meets 2015 and 2018 IRC and IBC code requirements for various common wood framing applications. You can trust that it meets the necessary standards for a wide range of projects.

  • Double-Barrier Coating: The SDWS Timber Screw features a double-barrier coating that provides corrosion resistance equivalent to hot-dip galvanization. This makes it suitable for exterior and preservative-treated wood applications, as detailed in the evaluation report. Rest assured that your installations will be protected against the elements.

Upgrade your wood framing installations with the Strong-Drive SDWS Timber Screw (Exterior Grade). Its easy installation, high-strength design, and code compliance make it the ideal choice for professionals and DIY enthusiasts alike. Trust in its reliability and enjoy the peace of mind that comes with a secure and long-lasting connection.

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