Product Description
The Simpson S/HDU 7-7/8 in. Holdown for Cold-Formed Steel is an engineered structural connector from Simpson Strong-Tie, purpose-built for cold-formed steel framing systems. Designed to anchor the shearwall to the foundation and resist overturning forces, this holdown is a critical component in seismic and high-wind construction projects. The S/HDU series combines structural performance with field-friendly installation - its pre-deflected geometry virtually eliminates material stretch, resulting in low deflection under load, while self-drilling tapping screws into the studs reduce installation time and save labor cost.
Key Features
- Pre-deflected geometry - virtually eliminates material stretch for low deflection under load, delivering reliable structural performance where it matters most
- Cold-formed steel framing compatibility - engineered specifically for CFS applications, ensuring a precise fit and code-appropriate connection in light gauge steel builds
- Shearwall-to-foundation anchoring - resists overturning forces in seismic and high-wind conditions, making it suited for demanding structural requirements
- Self-drilling screw installation - installs using self-drilling tapping screws into the stud, reducing installation time and cutting labor costs on the jobsite
- Zinc Galvanized, G90 coating and finish - provides corrosion resistance appropriate for cold-formed steel framing environments, supporting long-term connector integrity
- 10 gauge (118 mil) steel construction - delivers the material strength required for holdown applications in structurally engineered cold-formed steel assemblies
Why This Product
- Engineered for CFS from the ground up - unlike generic connectors adapted for multiple framing types, the S/HDU series is designed specifically for cold-formed steel, giving structural engineers and framers a connector built to meet the unique demands of CFS shearwall systems
- Faster installation, lower labor cost - the self-drilling screw attachment method eliminates pre-drilling steps and speeds up the connection process, translating directly to time savings on the jobsite
- Proven low-deflection performance - the pre-deflected geometry addresses one of the most common challenges in holdown design by minimizing material stretch, resulting in tighter, more predictable performance under overturning loads
- Versatile application range - rated and approved for high-wind construction, seismic new construction, and shearwall applications, making this a single connector solution across multiple code-required structural scenarios
Specifications
- Model Number: S/HDU4
- Height: 7-7/8 in.
- Thickness: 118 mil
- Gauge: 10 ga.
- Coating: Zinc Galvanized, G90
- Finish: Zinc Galvanized, G90
- Installation: Install with (6) #14 self-drilling screws to the stud and (1) 5/8 in. diameter anchor bolt to structure
- Country of Origin: United States
Approved Applications
- High-Wind Construction
Frequently Asked Questions
What type of framing is the Simpson S/HDU4 holdown designed for?
The S/HDU4 is specifically designed for use with cold-formed steel (CFS) framing. It is part of Simpson Strong-Tie's line of cold-formed steel connectors engineered to provide the strength and performance required in CFS applications.
What fasteners are required to install the S/HDU4 holdown?
Installation requires (6) #14 self-drilling screws to connect the holdown to the stud and (1) 5/8 in. diameter anchor bolt to connect it to the structure.
What is the purpose of the pre-deflected geometry on the S/HDU series?
The pre-deflected geometry of the S/HDU series virtually eliminates material stretch, resulting in low deflection under load. This design feature contributes to improved structural performance once the holdown is subjected to overturning forces.
What corrosion protection does the S/HDU4 holdown have?
The S/HDU4 features a Zinc Galvanized, G90 coating and finish, providing corrosion resistance suitable for cold-formed steel framing applications.
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