The Simpson HDUE 23-1/16 in. Hot-Dip Galvanized Predeflected Holdown with Strong-Drive SDS Screws from Simpson is engineered to deliver exceptional overturning resistance for shearwalls, braced wall panels, and other lateral-force-resisting applications in wood construction. Built from 12-gauge steel with a hot-dip galvanized finish for superior corrosion resistance, this holdown combines a predeflected seat, angled fastening geometry, and an overlapping back plate to maximize structural performance while simplifying installation - making it a dependable, high-performance choice for modern residential construction.

Key Features

• Predeflected seat - reduces deflection under load so the connection maintains tighter, more consistent performance in lateral-force-resisting applications.
• Angled fastening design - engages screws in tension for higher load capacity, meaning fewer fasteners are needed to achieve the required holding strength.
• Angled fastening tabs and offset holes on the second back plate - guide the fastener to drive at a 45 deg. angle and prevent straight driving, ensuring every screw seats correctly for full load engagement.
• Overlapping back plate - increases fastener strength and shear values while helping prevent post splitting, adding a critical layer of structural integrity at the connection point.
• Optimized screw patterns - reduce splitting at the end of the post and maximize individual fastener capacity, protecting the wood member and the overall connection.
• Extruded seat - adds a greater cross-sectional steel section for added strength where vertical load transfers into the holdown.
• Teardrop holes - allow higher and more even distribution of load across the connector, reducing stress concentrations that can compromise long-term performance.
• Hot-dip galvanized 12-gauge steel construction - provides extra corrosion resistance purpose-built for exterior environments and treated-wood applications where standard coatings fall short.
• Includes Strong-Drive SDS Heavy-Duty Connector screws and a crescent washer - everything needed for a complete, code-ready installation arrives with the holdown, eliminating separate fastener sourcing.

Why This Product

• Engineered to minimize deflection from the start - the predeflected seat addresses one of the most common weak points in holdown performance, giving builders confidence that the connection will behave predictably under real lateral loads.
• Faster installation without sacrificing capacity - the angled fastening system reduces the total number of screws required while still delivering high load values, cutting labor time on the job site.
• Built for demanding environments - hot-dip galvanization provides a level of corrosion resistance that makes this holdown a reliable long-term choice for exterior framing and applications involving treated lumber.
• A complete, job-site-ready solution - the inclusion of Strong-Drive SDS screws and a crescent washer means installers have the correct, manufacturer-specified hardware on hand, reducing the risk of mismatched fasteners and keeping the project moving.

Specifications

• Model Number: HDUE13-SDS3.5HDG
• Gauge: 12
• Height (H): 23-1/16 in.
• Width (W): 3 in.
• B: 4-5/16 in.
• CL: 1-7/16 in.
• SO: 1-1/2 in.
• Coating: Hot-Dip Galvanized
• Finish: Hot-Dip Galvanized
• Installation Hardware: Install with 1 in. anchor bolt and (23) 1/4 in. x 3-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws (included)
• Country of Origin: United States

Approved Applications

• Shearwall securing and overturning resistance
• Braced wall panel connections
• Lateral-force-resisting applications in wood construction
• Exterior and treated-wood applications requiring enhanced corrosion resistance

What's Included

Each pack contains (1) HDUE13-SDS3.5HDG Hot-Dip Galv. Predeflected Holdown, (23) 1/4 in. x 3-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws and (1) crescent washer.

Frequently Asked Questions

What makes the predeflected seat on the HDUE13-SDS3.5HDG beneficial?

The predeflected seat is specifically engineered to reduce deflection under load, helping the holdown maintain tighter, more consistent performance in lateral-force-resisting applications compared to standard holdown designs.

Why is hot-dip galvanization important for this holdown?

Hot-dip galvanization (HDG) provides an extra layer of corrosion resistance, making the HDUE13-SDS3.5HDG especially suitable for exterior applications and installations involving treated wood, where standard finishes may not hold up as reliably over time.

How does the angled fastening design improve performance?

The angled fastening tabs help drive each fastener at a 45 deg. angle, engaging the Strong-Drive SDS screws in tension rather than shear. This approach delivers higher load capacity while reducing the total number of screws required. Offset holes on the second back plate also prevent fasteners from being driven straight, ensuring consistent installation.

What fasteners and hardware are required to install the HDUE13-SDS3.5HDG?

Installation requires a 1 in. anchor bolt along with (23) 1/4 in. x 3-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws, which are included with the holdown, along with a crescent washer.

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