The Simpson S/HDU 12-7/8 in. Holdown for Cold-Formed Steel is a Simpson Strong-Tie engineered connector built to anchor shearwalls to the foundation and resist overturning forces in cold-formed steel framing systems. Part of the S/HDU series, this holdown features a pre-deflected geometry that virtually eliminates material stretch, delivering low deflection under load - a critical performance characteristic for high-wind and seismic applications. Installation is carried out using self-drilling tapping screws directly into the studs, reducing installation time and saving labor cost on cold-formed steel jobsites.

Key Features

• Designed for cold-formed steel framing - purpose-built for CFS construction, ensuring full compatibility with light-gauge steel shearwall systems in residential and commercial projects
• Anchors the shearwall to the foundation to resist overturning - provides a critical structural connection that keeps shearwalls stable under high-wind and seismic loading
• Pre-deflected geometry - virtually eliminates material stretch so the holdown delivers low deflection under load, maintaining structural integrity where it matters most
• 12-7/8 in. height, made from 118 mil (10 ga.) steel - heavy-gauge construction provides the strength and rigidity demanded by load-bearing CFS framing applications
• Zinc Galvanized G90 coating - factory-applied corrosion resistance protects the connector throughout the life of the structure in cold-formed steel environments
• Self-drilling tapping screw installation - fastens directly into the stud without pre-drilling, cutting installation time and reducing labor cost on the jobsite

Why This Product

• Low deflection where structural performance counts - the pre-deflected geometry sets this holdown apart by virtually eliminating material stretch, making it a reliable choice for shearwall applications in seismic and high-wind construction
• Faster installation, lower labor cost - self-drilling tapping screw attachment to the stud means no pre-drilling step, helping crews work more efficiently on cold-formed steel framing projects
• Built for demanding CFS applications - 10-gauge steel construction and a G90 galvanized finish combine structural strength with lasting corrosion resistance, supporting use in high-wind construction and new seismic construction alike
• Engineered specifically for cold-formed steel systems - unlike generic connectors, this holdown is designed from the ground up for CFS framing, giving contractors and engineers confidence in its fit, performance, and code-compliance path for shearwall and overturning applications

Specifications

• Model Number: S/HDU9
• Height: 12-7/8 in.
• Gauge: 10
• Thickness: 118 mil
• Coating/Finish: Zinc Galvanized, G90
• Country of Origin: United States
• Installation: Install with (18) #14 self-drilling screws to the stud and (1) 7/8 in. diameter anchor bolt to structure

Approved Applications

• High-Wind Construction

Frequently Asked Questions

What type of framing is the S/HDU9 holdown designed for?

The S/HDU9 is specifically designed for use with cold-formed steel (CFS) framing systems, making it suitable for a wide range of light-gauge steel construction projects.

What fasteners are required to install the S/HDU9?

Installation requires (18) #14 self-drilling screws to attach the holdown to the stud and (1) 7/8 in. diameter anchor bolt to connect it to the structure.

What does the pre-deflected geometry of the S/HDU series do?

The pre-deflected geometry virtually eliminates material stretch, which results in low deflection under load - an important performance characteristic for shearwall holdown applications.

What corrosion protection does the S/HDU9 have?

The S/HDU9 is coated with a Zinc Galvanized G90 finish, providing corrosion resistance suitable for cold-formed steel framing environments.