The Simpson HDU5-SDS2.5 13-3/16 in. Galvanized Predeflected Holdown is an engineered connector built for shearwall, braced-wall panel, and lateral load applications in wood-frame construction. Simpson designs and manufactures these holdowns with a predeflected body - intentionally shaped during production to virtually eliminate deflection under load due to material stretch - so structural connections stay tight and reliable throughout the life of the building. Strong-Drive SDS Heavy-Duty Connector screws are included, making this a ready-to-install solution that pairs performance with job-site convenience.

Key Features

• Predeflected body - virtually eliminates deflection due to material stretch, delivering a tighter, more dependable connection compared to standard holdowns
• Strong-Drive SDS screw installation - screws install easily and reduce fastener slip, giving the installer a faster, more secure fastening method than traditional bolts
• Greater net section area of the post - SDS screws preserve more wood section than bolts, helping maintain the structural integrity of the post at the connection point
• No stud bolts to countersink at openings - simplifies installation and reduces labor time, particularly at wall openings where countersinking adds complexity
• SDS screws supplied with the holdown - ensures the correct fasteners are always used, removing guesswork and reducing the risk of specification errors in the field
• 14-gauge steel construction with G90 zinc galvanized finish - provides the structural strength and corrosion resistance needed for demanding framing environments

Why This Product

• Engineered to hold its position under load - the predeflected manufacturing process sets this holdown apart from conventional options by proactively addressing material stretch before installation, not after
• A complete fastening solution out of the package - the included SDS screws and crescent washer mean the right hardware is always on hand, keeping installations consistent and code-compliant
• Designed to simplify wood-frame lateral connections - eliminating countersunk stud bolts and using screw-based fastening reduces steps at the wall, making it a practical choice for shearwall and braced-wall panel work
• Built and tested to Simpson quality standards - manufactured in the United States and engineered to perform, this holdown reflects the same commitment to structural reliability that makes Simpson connectors a trusted name in wood construction

Specifications

• Model Number: HDU5-SDS2.5
• Height: 13-3/16 in.
• Gauge: 14
• Coating: Zinc Galvanized, G90
• Finish: Zinc Galvanized, G90
• 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) HDU5-SDS2.5 Predeflected Holdown, (14) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws and (1) crescent washer.

Frequently Asked Questions

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

The HDU5-SDS2.5 holdown body is pre-deflected during the manufacturing process. This means the connector is intentionally shaped before installation so that once it is placed under load, it virtually eliminates deflection due to material stretch. The result is a tighter, more reliable connection with less movement over the life of the structure.

Why are SDS screws used instead of bolts on this holdown?

The 1/4 in. x 2-1/2 in. 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 for stud bolts to be countersunk at openings, simplifying the installation process.

Are the fasteners included with the HDU5-SDS2.5?

Yes. The HDU5-SDS2.5 includes (14) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws and (1) crescent washer, ensuring that the proper fasteners are always used with this holdown.

What material and coating is the HDU5-SDS2.5 made from?

The HDU5-SDS2.5 is made from 14-gauge steel with a Zinc Galvanized, G90 coating and finish, providing extra corrosion resistance for long-lasting structural performance.

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