Simpson HDU11-SDS2.5 HDU 22-1/4 in. Galvanized Predeflected Holdown with Strong-Drive SDS Screws is an engineered holdown connector from Simpson Strong-Tie, designed for use in shearwalls, braced-wall panels, and other lateral applications in wood construction. The HDU holdown is pre-deflected during the manufacturing process, virtually eliminating deflection under load due to material stretch, delivering a stronger, safer, and more reliable connection in demanding structural applications.

Key Features

• Predeflected body virtually eliminates deflection due to material stretch
• Uses SDS screws, which install easily, reduce fastener slip and provide a greater net section area of the post compared to bolts
• SDS screws are supplied with the holdowns to ensure proper fasteners are used
• No stud bolts to countersink at openings
• Height: 22-1/4 in.
• Made from 10-gauge steel
• Galvanized (G90) for extra corrosion resistance

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

• View Specifications

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.