Simpson HD7B HDB 12-3/8 in. Galvanized (G90) Bolted Holdown is engineered by Simpson to deliver reliable, low-deflection performance for intermediate-load-range shearwalls, braced-wall panels, and lateral applications in wood construction. Installed with bolts directly into studs or columns after concrete placement and framing are in place, this bolted holdown handles a broad range of load requirements and is specifically suited for back-to-back installations where eccentricity is a concern.

Key Features

• Installed after concrete placement and framing is in place - fits naturally into standard construction sequencing without requiring pre-installation steps that can slow the job.
• Can be installed directly on the sill plate or raised above it - gives installers the flexibility to accommodate varying field conditions and project requirements.
• Self-jigging design - automatically ensures the code-required minimum of seven bolt diameters from the end of the post when installed flush with the sill plate, reducing layout time and helping maintain code compliance.
• Unique seat design that greatly minimizes deflection under load - delivers the low-deflection performance critical for shearwall and braced-wall panel applications where movement must be tightly controlled.
• Base made from 3/16-in. steel; body made from 10-gauge steel - a heavier base combined with a formed body balances strength at the anchor connection with a lighter overall profile.
• G90 zinc galvanized coating - provides a corrosion-resistant finish suited for exposed or treated-lumber environments where long-term durability matters.

Why This Product

• Built for intermediate-load-range lateral applications - the HD7B fills the performance gap between light-duty and heavy holdown connectors, making it a practical choice for shearwalls and braced-wall panels without oversizing the connection.
• Minimized deflection through a purpose-designed seat - the unique seat design directly reduces movement under load, an important factor in wood-frame lateral systems where cumulative drift can affect structural performance.
• Self-jigging geometry simplifies installation and code compliance - the holdown positions itself correctly relative to the post end when flush-mounted to the sill plate, reducing the chance of installation errors and the need for separate layout measurements.
• Designed for back-to-back holdown configurations - the HD7B directly addresses eccentricity concerns in double-sided installations, making it a reliable connector choice when opposing holdowns must transfer loads symmetrically through a shared post or column.

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.