The Simpson Strong-Drive SDWF Floor-to-Floor Screw is an engineered fastener designed to simplify wind-uplift restraint connections while delivering superior long-term structural performance. Measuring 0.270 in. in shank diameter and 20 in. in length with a variable thread design and Type-17 point, this screw attaches upper and lower walls together from the top, spanning the full floor system to establish a reliable connection within the continuous uplift load path of the structure. The innovative Take-Up Washer (TUW) - installed between the screw head and the sole plate of the upper floor - maintains a tight, high-performance connection even as lumber shrinks and settles over time. This 25-count kit arrives complete with every component required for a full installation, so crews can get to work without sourcing additional hardware.

Key Features

• Plate-to-plate connection made from the top - the screw spans the floor system and ties upper and lower walls together in one straightforward operation, eliminating the need for complex multi-component assemblies.
• Shrinkage compensation via the Take-Up Washer - the TUW automatically accounts for initial lumber shrinkage and settlement, keeping the connection tight and structurally sound over the life of the structure without re-fastening.
• Installs entirely from inside the structure - no exterior access is required on upper stories, improving job-site safety and eliminating the need for staging or scaffolding on the building's exterior.
• Flexible installation timing - fastening can be completed before or after exterior sheathing is applied, allowing crews to work the connection into any preferred sequence without rescheduling.
• One screw length works across multiple floor depths - reduces the number of screw sizes a crew needs to stock and manage on site, cutting down on material confusion and procurement complexity.
• 5/16 in. hex drive with included driver bit - the included hex driver bit matches the drive type right out of the box, so installation can begin immediately with no additional tooling to source.
• E-coat electrocoating finish - recommended for dry, low-corrosion environments, providing a consistent protective barrier suited to interior structural applications.
• Complete kit with all required hardware - 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 nothing is missing when it is time to install.

Why This Product

• A faster floor-to-floor connection method - simply drive the screw and install the take-up washer and the plate-to-plate connection is complete, making this significantly quicker than traditional wind-uplift restraint approaches that require more steps or hardware.
• Built-in long-term performance protection - the TUW's shrinkage compensation capability means the structural connection does not loosen as lumber dries over time, reducing the risk of callbacks or remediation work after the structure is complete.
• Designed for safer, interior-only installation - by eliminating all exterior upper-story work, this system reduces fall risk and removes the logistical burden of working on the outside face of a multi-story building during the fastening process.
• Everything needed is in one kit - because the package includes the screws, take-up washers, connector screws, driver bit, and depth guide together, there is no need to assemble components from multiple sources, keeping projects on schedule and organized on site.

Specifications

• Model Number (MPN): SDWF2720-TUW
• Shank Diameter: 0.270 in.
• Length: 20 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
• Quantity: 25

Approved Applications

• Fastening Floor-to-Floor

What's Included

This kit includes all required installation hardware:

• (25) Strong-Drive SDWF Floor-to-Floor screws
• (25) TUW take-up washers
• (100) Strong-Drive SD Connector screws (#9)
• 5/16 in. hex driver bit
• Screw depth guide to ensure proper SDWF engagement with TUW