Product Description
The Simpson HDU8-SDS2.5HDG 16-5/8 in. Hot-Dip Galvanized Predeflected Holdown is engineered by Simpson to deliver reliable uplift resistance in shearwall, braced-wall panel, and lateral load applications in wood construction. Built from 10-gauge steel with a predeflected body and a hot-dip galvanized finish, this holdown is designed to maintain structural integrity under load while standing up to the demands of exterior and treated-wood environments. Strong-Drive SDS Heavy-Duty Connector screws are included, making this a complete, installation-ready solution.
Key Features
- Predeflected body - virtually eliminates deflection due to material stretch under load, so the connection performs more consistently once installed and loaded compared to standard holdowns.
- Strong-Drive SDS Heavy-Duty Connector screws included - ensures the correct fasteners are always on hand, removing guesswork and helping maintain code-compliant installations from the start.
- SDS screws reduce fastener slip and provide a greater net section area of the post - compared to bolts, this translates to a stronger, tighter connection with less movement over time.
- No stud bolts to countersink at openings - simplifies the installation process, saving time and reducing labor at the jobsite.
- Hot-dip galvanization finish - offers extra corrosion resistance beyond standard coatings, making this holdown well suited for exterior applications and assemblies using pressure-treated lumber.
- Made from 10-gauge steel - provides a heavy-duty structural backbone capable of handling the demands of uplift and lateral force applications.
Why This Product
- A more stable connection right out of the box - the predeflected manufacturing process virtually eliminates stretch-related deflection under load, giving builders and engineers greater confidence in long-term connection performance without relying on field adjustments.
- Built for corrosive environments - hot-dip galvanization provides a level of corrosion resistance that makes this holdown a dependable choice for exterior framing and treated-wood construction where moisture and chemical exposure are ongoing concerns.
- Everything needed to install is included - Strong-Drive SDS screws and a crescent washer ship with the holdown, so crews can move straight to installation without sourcing compatible fasteners separately.
- Faster, cleaner installation compared to bolt-based alternatives - SDS screws drive quickly, reduce fastener slip, and eliminate the need to countersink stud bolts at openings, cutting steps from the installation process on shearwall and lateral bracing assemblies.
Specifications
- Model Number: HDU8-SDS2.5HDG
- Height: 16-5/8 in.
- Gauge: 10
- Coating: Hot-Dip Galvanized
- Finish: Hot-Dip Galvanized
- Install With: Install with 7/8 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) HDU8-SDS2.5HDG Predeflected Holdown, (20) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws and (1) crescent washer.
Downloads and Resources
Note: Product dimensions and/or screw or bolt holes may differ from picture. Please see item description for specifications.
Frequently Asked Questions
What does "predeflected" mean and why does it matter?
The HDU8-SDS2.5HDG holdown body is pre-deflected during the manufacturing process, which virtually eliminates deflection under load due to material stretch. This means the connector maintains its structural integrity more effectively once installed and loaded, compared to standard holdowns that can deflect over time.
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. There are also no stud bolts to countersink at openings, simplifying the installation process.
Is this holdown suitable for exterior or treated-wood applications?
Yes. The hot-dip galvanization (HDG) coating offers extra corrosion resistance, making the HDU8-SDS2.5HDG well suited for exterior and treated-wood applications where standard coatings may not provide adequate protection.
Do the required fasteners come with this holdown?
Yes. The holdown ships with (20) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws and (1) crescent washer to ensure the proper fasteners are used. A 7/8 in. anchor bolt is also required for installation but is not included.
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