Product Description
The Simpson HDU2-SDS2.5 8-11/16 in. Galvanized Predeflected Holdown from Simpson is engineered for demanding lateral load applications in wood construction, including shearwalls and braced-wall panels. Its predeflected seat design works to eliminate deflection under load, and the included Strong-Drive SDS Heavy-Duty Connector screws deliver a more reliable connection than traditional bolted alternatives - making this holdown a practical, performance-focused solution for structural wall assemblies.
Key Features
- Strong-Drive SDS Heavy-Duty Connector screws included - the correct fasteners ship with the holdown, so there is no guesswork about compatibility and installation can proceed without sourcing hardware separately
- Predeflected seat design - engineered to eliminate deflection under load, helping maintain structural integrity in shearwall and lateral load applications
- No stud bolts to countersink at openings - simplifies installation at wall openings and reduces labor compared to traditional bolted holdown connections
- 14-gauge steel construction - provides a robust, heavy-duty connector suitable for the structural demands of lateral and shearwall applications
- G90 zinc galvanized finish - adds a corrosion-resistant coating that helps protect the connector in exposed or moisture-prone conditions
Why This Product
- Fasteners included for a complete, verified connection - because the Strong-Drive SDS screws are supplied with the holdown, installers always have the right hardware on hand and avoid the risk of substituting incompatible fasteners
- Screw-based installation outperforms bolted alternatives - Strong-Drive SDS Heavy-Duty Connector screws install easily, reduce fastener slip, and provide a greater net section than bolts, resulting in a stronger and more efficient connection
- Predeflection built in from the start - the predeflected seat addresses deflection before load is ever applied, which is particularly valuable in shearwall systems where movement tolerance is critical
- Designed and manufactured by Simpson - engineered and tested to perform to the highest quality standards, giving builders and contractors confidence in the connector's reliability for wood-frame lateral load systems
Specifications
- Model Number: HDU2-SDS2.5
- Height: 8-11/16 in.
- Gauge: 14
- Coating: Zinc Galvanized, G90
- Finish: Zinc Galvanized, G90
- Country of Origin: United States
- 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)
Approved Applications
- Shearwalls
- Braced-wall panels
- Other lateral applications in wood construction
What's Included
Each pack contains (1) HDU2-SDS2.5 Predeflected Holdown, (6) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws and (1) crescent washer.
Downloads and Resources
Frequently Asked Questions
- What type of fasteners are used with the HDU2-SDS2.5 holdown?
- The HDU2-SDS2.5 is designed to be used with 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws, which are included with the holdown to ensure the correct fasteners are always used. It also requires a 5/8 in. anchor bolt for installation.
- What is the benefit of the predeflected seat on this holdown?
- The predeflected seat is engineered to eliminate deflection under load, which helps maintain structural integrity and performance in shearwall and lateral load applications in wood construction.
- Why use SDS screws instead of bolts in this holdown?
- The Strong-Drive SDS Heavy-Duty Connector screws install easily, reduce fastener slip, and provide a greater net section than bolts. Because no stud bolts need to be countersunk at openings, installation is simplified compared to traditional bolted holdowns.
- What is the corrosion resistance rating of the HDU2-SDS2.5?
- The HDU2-SDS2.5 features a Zinc Galvanized, G90 coating, providing extra corrosion resistance suitable for demanding construction environments.
Related Products
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.
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