Simpson HDUE13-SDS3.5HDG HDUE 23-1/16 in. Hot-Dip Galvanized Predeflected Holdown with Strong-Drive SDS Screws by Simpson Strong-Tie 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 features a predeflected seat that minimizes deflection under load - making it a dependable, high-performance solution for modern residential construction.

Key Features

• Predeflected seat reduces deflection under load
• Angled fastening engages the screws in tension for higher load capacity, reducing the number of screws required
• Angled fastening tabs help drive the fastener at a 45 deg. angle, and offset holes on the second back plate block the fastener from being driven straight
• Overlapping back plate increases fastener strength and shear values, helping prevent post splitting
• Optimized screw patterns reduce splitting at the end of the post and maximize individual fastener capacity
• Extruded seat adds a greater cross-sectional steel section for added strength
• Teardrop holes allow higher and more even distribution of load
• Height: 23-1/16 in.
• Made from 12-gauge steel; hot-dip galvanization (HDG) offers extra corrosion resistance for exterior and treated-wood applications

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.