The Simpson HD5B HDB 9-3/8 in. Galvanized (G90) Bolted Holdown by Simpson Strong-Tie is engineered to provide reliable load performance for intermediate-load-range shearwalls, braced-wall panels, and lateral applications in wood construction. Installed with bolts into studs or columns, this holdown delivers 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 5/8 in. anchor bolt and 3/4 in. stud machine bolts

Specifications

• Model Number: HD5B
• Width: 2-1/2 in.
• Height: 9-3/8 in.
• Gauge: 10
• Coating/Finish: Zinc Galvanized, G90
• 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 shearwall holdown connections
• Braced-wall panel lateral applications in wood construction
• Back-to-back holdown installations where eccentricity must be minimized
• Connections into studs or columns requiring low-deflection performance

Frequently Asked Questions

What fasteners are required to install the HD5B holdown?

The HD5B is installed with a 5/8 in. anchor bolt for the concrete connection and 3/4 in. stud machine bolts for the wood framing connection.

Can the HD5B be installed directly on the sill plate?

Yes. The HD5B can be installed directly on the sill plate or raised above it, offering flexibility to suit different framing conditions. When installed flush with the sill plate, the self-jigging design ensures the code-required minimum of seven bolt diameters from the end of the post is maintained.

Is the HD5B suitable for back-to-back installations?

Yes. The HD5B HDB holdown is specifically suited for back-to-back applications where eccentricity is a concern, making it a practical choice for double-sided shearwall or column connections.

What is the corrosion-resistance rating of the HD5B, and what is it made from?

The HD5B features a Zinc Galvanized G90 coating for corrosion resistance. The base is made from 3/16-in. steel, while the body is constructed from 10-gauge steel, providing a robust combination of strength and durability.