The Simpson HD9BHDG HDB 14 in. Hot-Dip Galvanized Bolted Holdown from Simpson Strong-Tie is engineered 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, this bolted holdown accommodates a range of load requirements while its hot-dip galvanized finish provides extra corrosion resistance, making it a dependable choice for exterior and treated-wood environments. Its back-to-back compatibility also addresses eccentricity concerns where dual installations are required.

Key Features

• Installed after concrete placement and framing is in place - fits naturally into the construction sequence without requiring early coordination, reducing scheduling complexity on the job site.
• Can be installed directly on the sill plate or raised above it - gives contractors the flexibility to adapt to varying framing conditions and post heights without sourcing an alternate connector.
• Self-jigging design - automatically positions the holdown to maintain the code-required minimum of seven bolt diameters from the end of the post when installed flush with the sill plate, simplifying installation and supporting code compliance without extra layout steps.
• Unique seat design that greatly minimizes deflection under load - keeps structural movement tight under lateral forces, contributing to a stiffer, more stable wall system over the life of the structure.
• Base made from 3/8-in. steel; body made from 7-gauge steel - the combination of a heavier base and formed-steel body delivers the structural integrity needed for intermediate-load shearwall and braced-wall panel applications.
• Hot-dip galvanized coating - provides extra corrosion resistance beyond standard finishes, making this holdown suitable for exterior installations and applications where treated lumber is in contact with the connector.
• Suitable for back-to-back applications where eccentricity is a concern - allows paired installations without introducing problematic load offset, simplifying design for double-sided shearwall assemblies.

Why This Product

• Post-pour installation fits real-world job-site sequencing - because the holdown is installed after concrete placement and framing is complete, contractors avoid the coordination challenges tied to embed-style anchors, keeping projects on schedule.
• Hot-dip galvanization built for demanding exposure conditions - the HDG finish offers extra corrosion resistance specifically suited to exterior applications and treated-wood contact, adding long-term durability in environments where a standard finish would fall short.
• Low-deflection performance through a purpose-engineered seat - the unique seat design greatly minimizes movement under load, making this holdown a strong fit for shearwalls and braced-wall panels where controlling drift is a structural priority.
• Self-jigging simplicity reduces installation error - the built-in self-jigging feature automatically ensures proper bolt spacing from the post end, cutting layout time and helping crews maintain compliance with code requirements without additional measuring.

Specifications

• MPN: HD9BHDG
• Brand: Simpson Strong-Tie
• Series: HDB
• Height: 14 in.
• Width: 2-7/8 in.
• Gauge: 7
• Coating: Hot-Dip Galvanized
• Finish: Hot-Dip Galvanized
• Base Material Thickness: 3/8 in. steel
• Install With: Install with 7/8 in. anchor bolt and 7/8 in. stud machine bolts
• Hole Bottom: 6-1/8 in.
• Seat Depth: 2-1/2 in.
• Centerline: 1-1/4 in.
• Screw Offset: 2-3/8 in.
• Country of Origin: United States

Approved Applications

• Intermediate-load-range shearwalls
• Braced-wall panels
• Lateral applications in wood construction
• Back-to-back installations where eccentricity is a concern
• Exterior applications requiring enhanced corrosion resistance
• Treated-wood applications

Frequently Asked Questions

When during construction is the HD9BHDG holdown installed?

The HD9BHDG is installed after the placement of concrete and framing is in place, allowing it to be integrated into the structure at the appropriate stage of construction.

Can the HD9BHDG be installed in a raised position above the sill plate?

Yes. The HD9BHDG can be installed directly on the sill plate or raised above it, providing flexibility to accommodate various framing conditions and installation requirements.

Why is the HD9BHDG 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 HD9BHDG suitable for exterior and treated-wood applications?

The hot-dip galvanization (HDG) finish provides extra corrosion resistance compared to standard coatings, making the HD9BHDG well suited for exterior environments and use with treated wood where moisture and chemical exposure are a concern.