The Simpson 10-15/16 in. Predeflected Holdown Hot-Dip Galvanized with Strong-Drive SDS Screws is a Simpson engineered holdown connector built for shearwall, braced-wall panel, and lateral-load applications in wood-frame construction. Its body is pre-deflected during the manufacturing process, which virtually eliminates deflection under load due to material stretch - delivering a more stable, reliable connection right out of the box. Strong-Drive SDS Heavy-Duty Connector screws are included, so installers have the correct fasteners on hand from the start, skipping the countersinking steps and fastener-slip concerns that come with traditional bolt-based holdowns.

Key Features

• Predeflected body - virtually eliminates deflection under load due to material stretch, maintaining connection integrity in demanding lateral-load applications
• Strong-Drive SDS Heavy-Duty Connector screws included - ensures the correct fasteners are always used, removing guesswork and reducing the risk of installation errors on the job site
• SDS screws reduce fastener slip and provide a greater net section area of the post compared to bolts - resulting in a stronger, more secure connection with less movement under load
• No stud bolts to countersink at openings - simplifies installation and saves labor time, particularly at shearwall openings where bolt countersinking is otherwise required
• 14-gauge steel construction - provides the structural strength needed to handle the shear and uplift forces typical of holdown applications
• Hot-dip galvanized coating - delivers extra corrosion resistance beyond standard finishes, making this holdown well suited for exterior installations and connections to pressure-treated lumber

Why This Product

• Built to minimize deflection from the start - because the holdown body is pre-deflected during manufacturing, you get a connection that resists material stretch under load without relying on field adjustments or additional hardware
• Faster, cleaner installation compared to bolt-based holdowns - SDS screws drive quickly, eliminate countersinking at openings, and reduce fastener slip, cutting down on installation steps without sacrificing holding strength
• Ready to install with everything included - the supplied SDS screws and crescent washer mean no separate fastener sourcing, keeping projects on schedule and ensuring the right components are paired together every time
• Corrosion-resistant finish for tough environments - hot-dip galvanization provides a level of protection suited for exterior conditions and treated-wood contact, where lighter coatings may fall short over time

Specifications

• MPN: HDU4-SDS2.5HDG
• Brand: Simpson Strong-Tie
• Height: 10-15/16 in.
• Gauge: 14
• Coating: Hot-Dip Galvanized
• Finish: Hot-Dip Galvanized
• Install With: Install with 5/8 in. anchor bolt and 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws (included)
• Country of Origin: United States

What's Included

Each pack contains (1) HDU4-SDS2.5HDG Predeflected Holdown, (10) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws and (1) crescent washer.

Downloads and Resources

• View Specifications

Frequently Asked Questions

What does "predeflected" mean and why does it matter?

The HDU4-SDS2.5HDG holdown body is pre-deflected during the manufacturing process, which virtually eliminates deflection under load due to material stretch. This results in a more stable and reliable connection in shearwall and lateral-load applications compared to standard holdowns.

Why are SDS screws used instead of bolts?

Strong-Drive SDS Heavy-Duty Connector screws install easily, reduce fastener slip, and provide a greater net section area of the post compared to bolts. They also eliminate the need to countersink stud bolts at openings, simplifying the installation process.

Is this holdown suitable for exterior or treated-wood applications?

Yes. The hot-dip galvanization (HDG) coating offers extra corrosion resistance, making the HDU4-SDS2.5HDG well suited for exterior environments and applications involving treated wood where standard coatings may be insufficient.

Do the correct fasteners come with this holdown?

Yes. The package includes (10) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws and (1) crescent washer, ensuring the proper fasteners are used for a code-compliant and correctly assembled installation. A 5/8 in. anchor bolt is also required for installation.

Note: Product dimensions and/or screw or bolt holes may differ from picture. Please see item description for specifications.