Product Description
The Simpson Strong-Tie HD12 HD 20-5/16 in. Bolted Holdown is a high-capacity, low-deflection holdown engineered by Simpson Strong-Tie to create high allowable loads for both vertical and horizontal applications in wood construction. Installed with bolts directly into posts or columns, the HD12 delivers reliable structural performance and can be installed back to back when eccentricity is an issue.
Key Features
- High-capacity low-deflection holdown
- Self-jigging, ensuring the code-required minimum of seven bolt diameters from the end of the post when installed flush with the sill plate
- May be raised and installed off the sill plate
- Can be installed back to back when eccentricity is an issue
- Width: 3-1/2 in.
- Height: 20-5/16 in.
- Base: 3/8 in. steel
- Body: 3-gauge steel
- Simpson Strong-Tie gray paint finish
- Made in the United States
Specifications
- MPN: HD12
- Width (W): 3-1/2 in.
- Height (H): 20-5/16 in.
- Gauge: 3
- Base/Seat Thickness: 3/8 in. steel
- Coating/Finish: Simpson Strong-Tie Gray Paint
- Install With: Install with 1 in. or 1-1/8 in. anchor bolt and (4) 1 in. stud machine bolts
- Country of Origin: United States
Frequently Asked Questions
- How is the Simpson HD12 holdown installed?
- The HD12 is installed with bolts into posts or columns. It requires 1 in. or 1-1/8 in. anchor bolt and (4) 1 in. stud machine bolts for proper installation.
- Can the HD12 be installed off the sill plate?
- Yes. The HD12 may be raised and installed off the sill plate, providing flexibility to accommodate various framing conditions on the job site.
- What does "self-jigging" mean for the HD12?
- The self-jigging design ensures the code-required minimum of seven bolt diameters from the end of the post is automatically achieved when the holdown is installed flush with the sill plate, simplifying installation and helping maintain code compliance.
- Can two HD12 holdowns be used together when eccentricity is a concern?
- Yes. The HD12 can be installed back to back when eccentricity is an issue, allowing for balanced load transfer in applications where alignment of forces is a structural concern.
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