The Simpson Strong-Drive SDWF Floor-to-Floor Screw Kit is purpose-built to simplify wind-uplift restraint connections in wood-framed construction, linking upper and lower walls through the floor system from a single top-down installation point. The 0.270 in. diameter, 24 in. length screw spans the entire floor assembly and creates a continuous uplift load path without requiring any exterior work on upper stories - improving both speed and jobsite safety. The innovative Take-Up Washer installs between the screw head and the sole plate of the upper floor, compensating for natural wood shrinkage and settlement to keep the connection tight over the life of the structure. This 25-count kit arrives complete with every component required for a ready-to-install floor-to-floor structural connection.

Key Features

• Plate-to-plate connection in one sequence - drive the screw, install the take-up washer, and the connection is complete, making this faster to install than competing floor-to-floor methods and reducing overall labor time on the job.
• Take-Up Washer shrinkage compensation - the TUW maintains a tight, reliable connection even after initial wood shrinkage and settlement occur, protecting long-term structural integrity without requiring return visits or re-tightening.
• Installs entirely from inside the structure - eliminates the need for exterior access or staging on upper stories, reducing fall risk and improving overall crew safety during installation.
• Fastening can be done before or after exterior sheathing is applied - gives crews flexibility in sequencing work and helps keep the project moving regardless of sheathing schedule.
• One screw length works across multiple floor depths - reduces the number of different screw lengths needed on site, simplifying procurement and cutting down on inventory management at the jobsite.
• Variable thread design and Type-17 point - the engineered thread geometry and self-starting point work together to drive cleanly through the floor assembly, reducing installation effort and split risk in the wood members.
• 5/16 in. hex drive - compatible with standard impact drivers and hex-drive tooling, so no specialty tools are required and crews can get to work immediately.
• E-coat electrocoating finish - recommended for dry, low-corrosion environments, providing a protective layer suited to interior wood-framed applications.
• Complete all-in-one kit - includes (25) SDWF screws, (25) TUW take-up washers, (100) Strong-Drive SD Connector screws (#9), a 5/16 in. hex driver bit, and a screw depth guide, so every required component arrives together and nothing needs to be sourced separately.

Why This Product

• A faster, safer alternative to traditional uplift connection methods - the top-down, inside-only installation eliminates exterior upper-story work and condenses the connection into a simple two-step sequence, helping crews close out structural tie-downs more quickly and safely.
• Built-in long-term performance through shrinkage compensation - unlike a standard screw connection that can loosen as lumber dries and settles, the Take-Up Washer actively maintains load-path integrity over time, reducing the risk of connection degradation without any additional field effort.
• Everything needed is in the box - the kit format means screws, washers, connector fasteners, the driver bit, and the depth guide are all included together, eliminating the guesswork of assembling compatible components and reducing the chance of missing hardware on the jobsite.
• Single screw length, multiple applications - the 24 in. SDWF screw accommodates varying floor depths without requiring a different product for each scenario, making it a practical stocking choice for contractors working across multiple project types.

Specifications

• Model Number (MPN): SDWF2724-TUW
• Shank Diameter: 0.270 in.
• Length: 24 in.
• Head Type: Hex Washer Head
• Head Diameter: 0.730 in.
• Drive Type: 5/16 in. Hex
• Thread Type: Variable Thread Design
• Thread Length: 5 in.
• Point Type: Type-17 Point
• Coating / Finish: E-coat Electrocoating
• Recommended Environment: Dry, low-corrosion environments
• Quantity: 25 screws per kit