Simpson HD7BHDG HDB 12-3/8 in. Hot-Dip Galvanized Bolted Holdown is a Simpson Strong-Tie engineered connector built to deliver reliable load resistance for intermediate-load-range shearwalls, braced-wall panels, and lateral applications in wood construction. Installed with bolts directly into studs or columns, this holdown provides low-deflection performance across a range of load requirements. Its self-jigging design and unique seat geometry make it well suited for back-to-back installations where eccentricity is a concern, while its hot-dip galvanized finish adds the corrosion resistance needed for exterior and treated-wood environments.

Key Features

• Installed after concrete placement and framing is in place - fits into the construction sequence without requiring pre-pour repositioning, saving time and reducing coordination complexity on the job site.
• Can be installed directly on the sill plate or raised above it - gives installers flexibility to accommodate varying site conditions and framing configurations without needing a different connector.
• Self-jigging design automatically maintains the code-required minimum of seven bolt diameters from the end of the post - when installed flush with the sill plate, this built-in alignment feature helps ensure code compliance and reduces layout errors during installation.
• Unique seat design greatly minimizes deflection under load - lower deflection means greater structural stability for shearwalls and braced-wall panels, helping the assembly perform as designed under lateral forces.
• Base constructed from 3/16 in. steel; body constructed from 10-gauge steel - the heavier base provides a solid bearing surface at the anchor point, while the 10-gauge body balances strength with practical weight for field handling.
• Hot-dip galvanization provides extra corrosion resistance - makes this holdown appropriate for exterior applications and installations involving treated wood, where standard coatings may not offer adequate long-term protection.
• Installed with a 7/8 in. anchor bolt and 3/4 in. stud machine bolts - specifying a defined fastener set simplifies procurement and helps ensure the connection achieves its rated load performance.

Why This Product

• Purpose-built for intermediate-load lateral applications - this bolted holdown is specifically designed for the load range common in shearwall and braced-wall panel construction, so structural designers can match the connector to the application without oversizing or undersizing.
• Low-deflection seat design supports structural integrity under real-world loads - minimizing movement at the holdown connection helps shearwalls and lateral systems perform consistently, reducing the risk of cumulative drift that can compromise a structure over time.
• Hot-dip galvanized finish extends service life in demanding environments - for projects involving treated lumber or exposed exterior conditions, the HDG coating provides a higher level of corrosion protection than standard finishes, making this connector a practical long-term choice.
• Self-jigging feature reduces installation error and supports code compliance - by automatically positioning the connector to the correct bolt spacing when placed flush with the sill plate, the HD7BHDG helps crews work efficiently while meeting code requirements for minimum bolt end distance.

Specifications

• MPN: HD7BHDG
• Brand: Simpson Strong-Tie
• Series: HDB
• Width: 2-1/2 in.
• Height: 12-3/8 in.
• Gauge: 10
• Base Material Thickness: 3/16 in. steel
• Coating: Hot-Dip Galvanized
• Finish: Hot-Dip Galvanized
• Install With: 7/8 in. anchor bolt and 3/4 in. stud machine bolts
• Hole Bottom: 5-1/4 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
• Exterior applications requiring enhanced corrosion resistance
• Treated-wood construction applications

Frequently Asked Questions

What type of fasteners are required to install the HD7BHDG?

The HD7BHDG is installed with a 7/8 in. anchor bolt and 3/4 in. stud machine bolts. The connector is designed specifically for bolted installation into studs or columns.

Why is the HD7BHDG described as self-jigging?

The self-jigging design 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.

What makes the hot-dip galvanized finish beneficial for this holdown?

Hot-dip galvanization (HDG) provides extra corrosion resistance, making the HD7BHDG suitable for exterior applications and installations involving treated wood, where standard coatings may not offer adequate protection.

Can the HD7BHDG be used in back-to-back holdown configurations?

Yes. The HDB series, including the HD7BHDG, is specifically designed to be suitable for back-to-back applications where eccentricity is a concern, making it a versatile solution for a range of structural configurations.