Product Description
The Simpson Strong-Tie HD7B HDB 12-3/8 in. Galvanized (G90) Bolted Holdown is engineered by Simpson Strong-Tie to deliver reliable performance for intermediate-load-range shearwalls, braced-wall panels, and lateral applications in wood construction. Installed with bolts into studs or columns, this holdown offers low-deflection performance across a range of load requirements and is well-suited for back-to-back applications where eccentricity is a concern.
Key Features
- Installed after the placement of concrete and framing is in place
- Can be installed directly on the sill plate or raised above it
- Self-jigging, ensuring the code-required minimum of seven bolt diameters from the end of the post when installed flush with the sill plate
- Features a unique seat design which greatly minimizes deflection under load
- Base made from 3/16-in. steel; body made from 10-gauge steel
- Galvanized (G90) finish provides corrosion resistance for long-term durability
- Suitable for back-to-back applications where eccentricity is a concern
- Install with 7/8 in. anchor bolt and 3/4 in. stud machine bolts
Specifications
- MPN: HD7B
- Brand: Simpson Strong-Tie
- Width: 2-1/2 in.
- Height: 12-3/8 in.
- Gauge: 10
- Coating: Zinc Galvanized, G90
- Finish: Zinc Galvanized, G90
- Install With: 7/8 in. anchor bolt and 3/4 in. stud machine bolts
- Hole Bottom: 5-1/4 in.
- SB: 3 in.
- Seat Depth: 2-1/2 in.
- Centerline: 1-1/4 in.
- Screw Offset: 2 in.
- Country of Origin: United States
Approved Applications
- Intermediate-load-range shearwalls
- Braced-wall panels
- Lateral applications in wood construction
- Back-to-back holdown installations where eccentricity is a concern
- Installations directly on the sill plate or raised above it
Frequently Asked Questions
- What fasteners are required to install the HD7B bolted holdown?
- The HD7B is installed with a 7/8 in. anchor bolt and 3/4 in. stud machine bolts, connecting the holdown securely to both the concrete foundation and the wood framing members.
- What is the significance of the self-jigging feature on the HD7B?
- The self-jigging design of the HD7B automatically ensures the code-required minimum of seven bolt diameters from the end of the post when the holdown is installed flush with the sill plate, simplifying installation and helping maintain code compliance.
- Why is the HD7B suitable for back-to-back applications?
- The HD7B is specifically designed to address eccentricity concerns, making it an appropriate choice for back-to-back holdown installations where balanced load transfer between opposing framing members is required.
- What is the G90 galvanized coating on the HD7B and why does it matter?
- The G90 designation refers to a zinc galvanized coating that provides corrosion resistance, helping to protect the holdown against moisture and environmental exposure over the service life of the structure.
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