HDU/HDUE/HDQ/HHDQ Holdowns

HDU, HDUE, HDQ & HHDQ Holdowns

HDU, HDUE, HDQ, and HHDQ Holdowns are high-capacity structural connectors engineered to resist uplift and overturning forces in wood framing systems. Commonly used in shear walls, multi-story construction, and high-wind or seismic zones, these heavy-duty holdowns are critical for maintaining continuous load paths.

At Fasteners Plus, we carry Simpson Strong-Tie HDU and HDQ series holdowns designed for demanding structural applications. Whether you're anchoring shear walls to concrete foundations or reinforcing vertical framing members, these connectors deliver dependable, code-compliant performance.

What Are HDU & HDQ Series Holdowns Used For?

These holdowns are installed at the ends of shear walls or structural framing assemblies to resist tension forces caused by wind and seismic activity. Properly installed holdowns help prevent wall overturning and structural uplift.

• Shear Wall Applications: Anchor wood walls to concrete foundations.
• Multi-Story Framing: Maintain vertical load paths through stacked framing systems.
• High-Wind & Seismic Zones: Resist uplift and overturning forces.
• Post-to-Foundation Connections: Provide high-capacity tension anchorage.

Differences Between HDU, HDUE, HDQ & HHDQ Holdowns

• HDU Holdowns: High-capacity holdowns for demanding uplift applications.
• HDUE Holdowns: Similar high-performance design with enhanced features for specific installation requirements.
• HDQ Holdowns: Heavy-duty holdowns designed for increased load capacity.
• HHDQ Holdowns: Extra heavy-duty versions for the most demanding structural applications.

Model selection depends on required allowable loads, anchor bolt size, and project design specifications.

Why Choose HDU & HDQ Series Holdowns?

• High Load Capacity: Engineered to handle significant tension forces.
• Code-Compliant Performance: Designed to meet modern building standards.
• Optimized Fastener Patterns: Pre-punched holes ensure proper installation.
• Durable Steel Construction: Built for long-term structural reliability.
• Trusted by Engineers & Contractors: Widely specified in structural framing designs.

Built for Structural Safety & Compliance

In seismic and high-wind environments, maintaining a continuous load path is critical. HDU and HDQ series holdowns provide the tension resistance necessary to anchor framing members securely and meet inspection requirements.

Fasteners Plus stocks high-capacity holdowns ready to ship. Most orders placed before 4:00 PM CST ship the same day from our centrally located distribution centers, helping keep your project on schedule.