The Simpson HDU14-SDS2.5 25-11/16 in. Galvanized Predeflected Holdown is a heavy-duty structural connector from Simpson engineered to resist uplift forces in shearwall, braced-wall panel, and lateral load applications in wood-frame construction. Its predeflected body and screw-based fastening system deliver consistent, dependable performance where structural integrity is critical - and every component needed for a complete, code-compliant installation is included right in the box.

Key Features

• Predeflected body - the holdown is deflected during manufacturing before it ever sees a load, virtually eliminating deflection under load due to material stretch so the connection stays tight and true over time
• Strong-Drive SDS Heavy-Duty Connector screws included - screws are supplied with the holdown to ensure proper fasteners are always used, saving a separate trip to the supply house and removing guesswork from the installation
• SDS screw fastening instead of bolts - screws install easily, reduce fastener slip, and provide a greater net section area of the post compared to bolts, resulting in a stronger, more reliable wood-to-hardware connection
• No stud bolts to countersink at openings - eliminates a time-consuming field step, simplifying installation and keeping the surrounding framing clean
• 7-gauge steel construction - heavy-gauge material provides the structural mass needed to handle demanding uplift loads in residential and light commercial framing
• Zinc Galvanized G90 finish - the factory-applied G90 coating delivers extra corrosion resistance, making this holdown suitable for use in environments where moisture exposure is a concern

Why This Product

• Built to virtually eliminate one of the most common holdown failure points - because the body is predeflected during the manufacturing process, material stretch under load is addressed before installation ever begins, giving builders and engineers greater confidence in long-term connection performance
• Faster, cleaner installation compared to bolt-based holdowns - SDS screws drive quickly without the need to countersink stud bolts at openings, reducing labor time and keeping the framing assembly straightforward
• Everything required for installation is included - the package ships with SDS screws, a crescent washer, and a heavy-hex anchor nut, so crews have the correct, Simpson-specified hardware on hand without sourcing additional components separately
• Engineered and manufactured to verified quality standards - Simpson connectors are tested to perform and built to the highest quality standards, providing the documented reliability that structural applications demand

Specifications

• Model Number: HDU14-SDS2.5
• Height: 25-11/16 in.
• Gauge: 7
• Coating/Finish: Zinc Galvanized, G90
• Install With: 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) HDU14-SDS2.5 Predeflected Holdown, (36) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws, (1) crescent washer and (1) heavy-hex anchor nut.

Downloads and Resources

• View Specifications

Frequently Asked Questions

What makes the HDU14-SDS2.5 different from holdowns that use bolts?

The HDU14-SDS2.5 uses Strong-Drive SDS Heavy-Duty Connector screws instead of bolts. These screws install easily, reduce fastener slip, and provide a greater net section area of the post compared to bolts, resulting in a stronger and more reliable connection.

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

Predeflected means the holdown body is deflected during the manufacturing process before it is ever installed. This virtually eliminates deflection under load due to material stretch, ensuring the connection maintains its integrity and performance over time.

What material and corrosion protection does this holdown have?

The HDU14-SDS2.5 is made from 7-gauge steel and finished with a Zinc Galvanized (G90) coating, providing extra corrosion resistance for long-term durability.

Do I need to purchase fasteners separately for the HDU14-SDS2.5?

No. The HDU14-SDS2.5 comes supplied with (36) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws, (1) crescent washer, and (1) heavy-hex anchor nut, ensuring the proper fasteners are always used with this holdown.

Related Products

• HDUE holdown

Note: The HDU holdown is being discontinued and replaced with the new HDUE holdown. Product dimensions and/or screw or bolt holes may differ from picture. Please see item description for specifications.