Simpson HDU14-SDS2.5HDG 25-11/16 in. Hot-Dip Galvanized Predeflected Holdown with Strong-Drive SDS Screws is a heavy-duty holdown connector from Simpson, engineered and tested for shearwall, braced-wall panel, and lateral load applications in wood construction. The predeflected body virtually eliminates deflection under load due to material stretch, giving builders a more rigid, reliable connection from the start. Included Strong-Drive SDS Heavy-Duty Connector screws simplify installation while reducing fastener slip and delivering a greater net section area of the post compared to bolts. The hot-dip galvanized finish makes this holdown a dependable choice for exterior environments and treated-wood framing applications.

Key Features

• Predeflected body - virtually eliminates deflection due to material stretch under load, resulting in a tighter, more consistent connection in lateral force-resisting systems
• Strong-Drive SDS Heavy-Duty Connector screws included - ensures the correct fasteners are always on hand and eliminates guesswork, saving time and reducing installation errors on the jobsite
• SDS screws reduce fastener slip and increase net section area - delivers a stronger post connection compared to traditional bolts, improving overall structural performance
• No stud bolts to countersink at openings - simplifies installation at wall openings and reduces labor steps during framing
• Made from 7-gauge steel - provides the structural mass needed to handle demanding holdown loads in wood-frame construction
• Hot-dip galvanized coating - offers extra corrosion resistance for long-term durability in exterior applications and wherever pressure-treated lumber is used

Why This Product

• Deflection is addressed before it starts - because the holdown body is predeflected during manufacturing, the material stretch that typically causes movement under load is virtually eliminated, so the connection performs with greater rigidity from the first loading cycle
• Everything needed for installation arrives in the box - the included Strong-Drive SDS screws, crescent washer, and heavy-hex anchor nut mean fewer separate hardware purchases and a faster path from delivery to installation
• SDS screws outperform bolts for this application - by reducing fastener slip and preserving more of the post's net section area, the screw-based fastening system translates directly into a stronger, more efficient wood connection
• Built for corrosive environments - the hot-dip galvanized finish goes beyond standard coatings to protect the connector in exterior framing, coastal conditions, and applications involving treated wood where corrosion is a genuine concern

Specifications

• Model Number: HDU14-SDS2.5HDG
• Height: 25-11/16 in.
• Gauge: 7
• Coating: Hot-Dip Galvanized
• Finish: Hot-Dip Galvanized
• 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-SDS2.5HDG 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

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Frequently Asked Questions

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

The HDU14-SDS2.5HDG holdown body is predeflected during the manufacturing process, which virtually eliminates deflection under load due to material stretch. This results in a more rigid, reliable connection in shearwall and lateral load applications.

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

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.

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

Yes. The hot-dip galvanized (HDG) coating offers extra corrosion resistance, making the HDU14-SDS2.5HDG well suited for exterior environments and applications involving treated wood.

What hardware is included with the HDU14-SDS2.5HDG?

The holdown includes 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws, a crescent washer, and a heavy-hex anchor nut. Installation requires a 1 in. anchor bolt (not included). The screws are supplied with the holdown to ensure proper fasteners are used.

Related Products

• Browse the HDUE HOLDOWN. collection for the updated replacement series.
• HDUE17-SDS4.5HDG - direct replacement for the HDU14-SDS2.5HDG.

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