The Simpson HDU11-SDS2.5 22-1/4 in. Galvanized Predeflected Holdown is an engineered structural connector from Simpson designed for shearwall, braced-wall panel, and lateral load applications in wood construction. The predeflected body is manufactured to virtually eliminate deflection under load caused by material stretch, and the holdown installs using Strong-Drive SDS Heavy-Duty Connector screws - included in the box - so the right fasteners are always on hand for a code-compliant connection.

Key Features

• Predeflected body - virtually eliminates deflection due to material stretch under load, delivering a more stable and reliable structural connection over time
• 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, improving overall connection strength
• Fasteners included - the holdown ships with the correct SDS screws and a crescent washer, ensuring proper fasteners are used and simplifying procurement on the job site
• No stud bolts to countersink at openings - eliminates a time-consuming installation step, speeding up the framing process without sacrificing structural integrity
• 10-gauge steel construction - provides the thickness and rigidity expected in heavy-duty holdown applications where performance under lateral loads is critical
• Zinc Galvanized, G90 finish - adds a layer of corrosion resistance suited for interior structural applications where long-term durability matters

Why This Product

• Virtually zero deflection by design - because the connector body is predeflected during manufacturing, buyers get a holdown that maintains tighter performance tolerances under load compared to conventional holdown designs that stretch over time
• Screw-based installation over bolts - switching from bolts to Strong-Drive SDS screws means faster installation, reduced fastener slip, and a greater net section area preserved in the post - a genuine structural and labor-saving advantage
• Complete, ready-to-install package - with the correct screws and washer already included, there is no need to source fasteners separately, reducing the chance of mismatched hardware and keeping the installation straightforward
• Built and tested to Simpson quality standards - engineered and manufactured to perform in demanding structural applications, this holdown reflects the same commitment to strength and safety that the Simpson brand is known for

Specifications

• Model Number: HDU11-SDS2.5
• Height: 22-1/4 in.
• Gauge: 10
• Coating/Finish: Zinc Galvanized, G90
• Install With: 1 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) HDU11-SDS2.5 Predeflected Holdown, (30) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws and (1) crescent washer.

Downloads and Resources

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Frequently Asked Questions

What makes the HDU11-SDS2.5 different from standard holdowns?

The HDU11-SDS2.5 features a predeflected body that is pre-deflected during the manufacturing process, virtually eliminating deflection under load due to material stretch. This gives it a significant performance advantage over conventional holdowns in structural applications.

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 installation.

Are the fasteners included with the HDU11-SDS2.5?

Yes. The holdown ships with (30) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws and (1) crescent washer to ensure the correct fasteners are used for a code-compliant installation.

What corrosion protection does the HDU11-SDS2.5 offer?

The HDU11-SDS2.5 is coated with a Zinc Galvanized, G90 finish, providing an extra layer of corrosion resistance that helps extend the service life of the connector in wood construction environments.

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