Product Description
The Simpson HHDQ11-SDS2.5 Heavy Holdown is a Simpson Strong-Tie heavy-duty holdown engineered specifically for extra-high load applications where structural reliability is critical. At 15 1/8 in. tall and built from 7-gauge steel, this holdown installs directly on the sill plate, making it well suited for back-to-back configurations where eccentricity is a concern. It ships complete with Strong-Drive SDS Heavy-Duty Connector screws so the correct fasteners are on hand from the moment installation begins.
Key Features
- Strong-Drive SDS Heavy-Duty Connector screws included - the right fasteners arrive with the holdown, eliminating guesswork and helping ensure a code-compliant, properly loaded connection every time.
- Screws install flush or raised off the mudsill - load values remain unchanged regardless of screw position, giving installers flexibility to work around field conditions without sacrificing performance.
- No stud bolts to countersink at openings - this simplifies the installation process, reduces labor time, and minimizes the risk of weakening the framing member at critical locations.
- 7-gauge steel construction with 1/2 in. plate washer - heavy-gauge material provides the structural capacity needed for demanding high-load uplift connections in wood-frame construction.
- Simpson Strong-Tie gray paint finish - a consistent factory-applied coating helps protect the steel connector during installation and throughout service life.
Why This Product
- Built for extra-high load demands - the HHDQ series is purpose-designed for applications where standard holdowns fall short, making this connector a dependable choice for high-uplift shear wall conditions.
- Faster, more precise installation - Strong-Drive SDS screws reduce fastener slip and provide a greater net section than bolts, meaning the connection goes together quickly while delivering superior load transfer compared to traditional bolt-based holdowns.
- Back-to-back application ready - the holdown is specifically suited for back-to-back installations where eccentricity must be controlled, reducing the need for custom engineering workarounds at paired-post conditions.
- Everything needed ships together - with the SDS screws included in the package, contractors can keep projects moving without sourcing separate fasteners or risking mismatched hardware on the jobsite.
Specifications
- Model Number: HHDQ11-SDS2.5
- Height: 15-1/8 in.
- Material: 7-gauge steel
- Plate Washer: 1/2 in.
- Finish: Simpson Strong-Tie Gray Paint
- Coating: Simpson Strong-Tie Gray Paint
- Install With: (1) 1 in. anchor bolt and (24) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws
- Width: 3 in.
- Seat Depth: 3-1/2 in.
- Centerline: 1-1/2 in.
- Screw Offset: 7/8 in.
- Country of Origin: United States
What's Included
Each pack contains (1) HHDQ11-SDS2.5 Heavy Holdown, (24) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws.
Downloads and Resources
Frequently Asked Questions
What type of fasteners are used with the HHDQ11-SDS2.5?
The HHDQ11-SDS2.5 installs using 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws, which are included with the holdown. These screws install easily, reduce fastener slip, and provide a greater net section than bolts. A 1 in. anchor bolt is also required for installation.
Can the screws be installed raised off the mudsill without affecting performance?
Yes. Screws may be installed either flush or raised off the mudsill without a reduction in load value, providing flexibility during installation.
Is the HHDQ11-SDS2.5 suitable for back-to-back installations?
Yes. The HHDQ is installed directly on the sill plate and is specifically suitable for back-to-back applications where eccentricity is a concern.
What gauge steel is used in the construction of this holdown?
The holdown is made from 7-gauge steel and includes a 1/2-in. plate washer, providing the structural strength needed for extra-high load applications.
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