The Simpson HDUE 23-1/16 in. Galvanized Predeflected Holdown with Strong-Drive SDS Screws by Simpson is purpose-built for securing shearwalls, braced wall panels, and other lateral-force-resisting connections in wood construction. Formed from 12-gauge steel with a G90 galvanized coating for corrosion resistance, this holdown combines a predeflected seat, an overlapping back plate, and engineered screw geometry to deliver a high-strength, low-deflection anchor connection. Installation is straightforward using the included Strong-Drive SDS Heavy-Duty Connector screws, making it a dependable solution for modern residential structural applications.

Key Features

• Predeflected seat - reduces deflection under load, helping the connection maintain structural integrity in lateral-force-resisting applications
• Angled fastening design - engages screws in tension for higher load capacity, so fewer screws are required compared to conventional fastening approaches
• Angled fastening tabs with offset holes - help drive each fastener at a 45 deg. angle while offset holes on the second back plate block straight driving, ensuring correct installation every time
• Overlapping back plate - increases fastener strength and shear values, helping prevent post splitting under demanding lateral loads
• Optimized screw patterns - reduce splitting at the end of the post and maximize individual fastener capacity for a stronger, more reliable connection
• Extruded seat - adds a greater cross-sectional steel section for added strength at the bearing point
• Teardrop holes - allow higher and more even distribution of load across the connector, reducing stress concentrations
• 12-gauge steel with G90 galvanized finish - provides a robust, corrosion-resistant holdown suited for long-term performance in residential wood construction

Why This Product

• Complete hardware included - the holdown ships with 23 Strong-Drive SDS Heavy-Duty Connector screws, a crescent washer, and a heavy-hex anchor nut, so installers have everything needed for a code-ready connection without sourcing fasteners separately
• Engineered to minimize deflection - the predeflected seat directly addresses one of the most critical performance concerns in holdown design, helping shearwall and braced panel assemblies stay tight and functional under real-world lateral loads
• Smarter fastening geometry means stronger results - the combination of angled fastening tabs, offset back plate holes, and optimized screw patterns works together to maximize load capacity while actively protecting the post from splitting during and after installation
• Built for residential lateral-force-resisting systems - approved for shearwall holdown connections and braced wall panel anchorage in wood structures, this connector is designed specifically for the applications where precision anchor performance matters most

Specifications

• Model Number: HDUE13-SDS3.5
• Height: 23-1/16 in.
• Width: 3 in.
• Gauge: 12
• Coating/Finish: Zinc Galvanized, G90
• Seat Depth: 4-5/16 in.
• Centerline: 1-7/16 in.
• Screw Offset: 1-1/2 in.
• Country of Origin: United States
• Installation: Install with 1 in. anchor bolt and (23) 1/4 in. x 3-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws (included)

Approved Applications

• Shearwall holdown connections in wood construction
• Braced wall panel anchorage
• Lateral-force-resisting applications in residential wood structures

What's Included

Each pack contains (1) HDUE13-SDS3.5 Galvanized Predeflected Holdown, (23) 1/4 in. x 3-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws and (1) crescent washer and (1) heavy-hex anchor nut.

Frequently Asked Questions

What type of fasteners are used to install the HDUE13-SDS3.5?

The HDUE13-SDS3.5 installs with 1 in. anchor bolt and (23) 1/4 in. x 3-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws, which are included with the holdown. The crescent washer and heavy-hex anchor nut are also included.

How does the predeflected seat benefit this holdown?

The predeflected seat is specifically designed to reduce deflection under load, which helps maintain the structural integrity and performance of the holdown connection in lateral-force-resisting applications.

What is the purpose of the angled fastening tabs on the HDUE13-SDS3.5?

The angled fastening tabs help drive the fastener at a 45 deg. angle, engaging the screws in tension for higher load capacity. The offset holes on the second back plate also block the fastener from being driven straight, ensuring proper installation and optimal performance.

What corrosion protection does the HDUE13-SDS3.5 offer?

The HDUE13-SDS3.5 is made from 12-gauge steel with a Zinc Galvanized G90 coating, providing reliable corrosion resistance suited for use in residential wood construction applications.

Note: Product dimensions and/or screw or bolt holes may differ from picture.