The Simpson HD5BHDG HDB 9-3/8 in. Hot-Dip Galvanized Bolted Holdown by Simpson 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 into studs or columns, this holdown is built to handle a range of load requirements while remaining well-suited for back-to-back applications where eccentricity is a concern. Its hot-dip galvanized finish provides extra corrosion resistance, making it a dependable choice for exterior environments and treated-wood applications.

Key Features

• Installed after concrete placement and framing is in place - allows the holdown to be added at the appropriate stage of construction without requiring advance embedment, simplifying the build sequence.
• Can be installed directly on the sill plate or raised above it - gives contractors installation flexibility to accommodate varying framing conditions and project requirements.
• Self-jigging design ensures the code-required minimum of seven bolt diameters from the end of the post when installed flush with the sill plate - saves layout time on the jobsite and helps keep installations code-compliant without additional measuring.
• Unique seat design greatly minimizes deflection under load - contributes to a stiffer, more stable connection in shearwall and lateral load applications where movement must be controlled.
• Base made from 3/16-in. steel; body made from 10-gauge steel - the dual-material construction pairs a heavy base for anchor strength with a formed body sized for practical installation in standard framing.
• Hot-dip galvanization provides extra corrosion resistance - makes this holdown suitable for exterior conditions and contact with treated lumber, where standard coatings may not hold up over time.
• Installed with 5/8 in. anchor bolt and 3/4 in. stud machine bolts - uses common fastener sizes that are straightforward to source and install with standard tools.

Why This Product

• Built for corrosive environments - the hot-dip galvanized coating goes beyond standard finishes to protect against moisture and chemical exposure, making this holdown a sound long-term choice for exterior and treated-wood framing applications.
• Low-deflection seat design supports structural performance - the unique seat geometry actively reduces movement under load, which is especially valuable in shearwall and braced-wall panel assemblies where deflection limits are critical to system performance.
• Self-jigging feature reduces installation error - by automatically positioning the holdown to satisfy the code-required minimum bolt spacing from the post end, the self-jigging design takes guesswork out of placement and helps avoid costly field corrections.
• Designed for back-to-back holdown configurations - the HDB series is specifically suited for applications where eccentricity is a concern, giving engineers and contractors a purpose-built solution for double-sided lateral assemblies rather than a workaround with a general-purpose connector.

Specifications

• MPN: HD5BHDG
• Brand: Simpson Strong-Tie
• Series: HDB
• Width: 2-1/2 in.
• Height: 9-3/8 in.
• Gauge: 10 (body); base made from 3/16-in. steel
• Coating: Hot-Dip Galvanized
• Finish: Hot-Dip Galvanized
• Install With: Install with 5/8 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 applications where eccentricity is a concern
• Exterior applications requiring enhanced corrosion resistance
• Treated-wood applications

Frequently Asked Questions

What type of fasteners are required to install the HD5BHDG?

The HD5BHDG is installed with 5/8 in. anchor bolt and 3/4 in. stud machine bolts into studs or columns.

Can the HD5BHDG be installed in exterior or treated-wood applications?

Yes. The hot-dip galvanization (HDG) finish provides extra corrosion resistance, making the HD5BHDG well-suited for exterior and treated-wood applications.

Can the HD5BHDG be installed directly on the sill plate?

Yes. The HD5BHDG can be installed directly on the sill plate or raised above it. When installed flush with the sill plate, its self-jigging design ensures the code-required minimum of seven bolt diameters from the end of the post.

What makes the HD5BHDG suitable for back-to-back holdown applications?

The HDB series is specifically designed to be suitable for back-to-back applications where eccentricity is a concern, and its unique seat design greatly minimizes deflection under load for reliable performance in these configurations.