The Simpson HDUE 27-7/8 in. Galvanized Predeflected Holdown with Strong-Drive SDS Screws is an engineered connector from Simpson designed to deliver exceptional strength and reliability for securing shearwalls, braced wall panels, and other lateral-force-resisting applications in wood construction. Built from 10-gauge steel with a G90 zinc galvanized finish, this holdown combines a predeflected seat, an overlapping back plate, and optimized screw patterns to provide dependable overturning resistance in modern residential wood-framed structures. Installation is straightforward using the included 1/4 in. x 4-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws, making it a practical and efficient choice for contractors working on shearwall and braced wall panel connections.

Key Features

• Predeflected seat - reduces deflection under load so the holdown maintains tighter tolerances and more consistent performance in lateral-force-resisting applications.
• Angled fastening that engages screws in tension - delivers higher load capacity per screw, meaning fewer fasteners are needed without sacrificing structural performance.
• Angled fastening tabs with offset holes on the second back plate - help drive the fastener at a 45 deg. angle while blocking straight-in driving, ensuring optimal fastener positioning and reducing post splitting risk.
• 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, so each screw works at its highest potential.
• Extruded seat - adds a greater cross-sectional steel section for added strength where load transfer is most critical.
• Teardrop holes - allow higher and more even distribution of load across the connector, contributing to more uniform structural performance.
• 10-gauge steel with G90 zinc galvanized finish - provides the structural rigidity and corrosion resistance needed for long-term reliability in wood construction applications.

Why This Product

• Engineered to minimize deflection from the start - the predeflected seat design addresses one of the most common performance limitations in holdown connectors, helping lateral-force-resisting systems perform closer to their rated capacity under real-load conditions.
• Faster installation without compromising load ratings - angled fastening technology reduces the number of screws required to achieve high load capacity, and the included Strong-Drive SDS Heavy-Duty Connector screws mean the hardware needed for a complete installation arrives with the connector.
• Multiple overlapping design features protect the post - the combination of an overlapping back plate, optimized screw patterns, and angled fastening tabs work together to reduce splitting risk at the post, protecting the structural member as well as the connection itself.
• Purpose-built for shearwall and braced wall panel applications - every design element, from the extruded seat to the teardrop holes, is oriented toward the specific demands of lateral-force-resisting connections in residential wood construction, making this holdown a focused solution rather than a general-purpose connector.

Specifications

• Model No.: HDUE17-SDS4.5
• Gauge: 10
• Width: 3 in.
• Height: 27-7/8 in.
• Coating/Finish: Zinc Galvanized, G90
• Seat Depth: 5-3/16 in.
• Centerline: 1-15/16 in.
• Screw Offset: 1-1/2 in.
• Country of Origin: United States
• Installation Hardware: Install with 1 in. anchor bolt and (28) 1/4 in. x 4-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws (included)

Approved Applications

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

What's Included

Each pack contains (1) HDUE17-SDS4.5 Predeflected Holdown, (28) 1/4 in. x 4-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws and (1) crescent washer.

Frequently Asked Questions

What is the purpose of the predeflected seat on the HDUE17-SDS4.5?

The predeflected seat is engineered to reduce deflection under load, helping the holdown maintain tighter tolerances and better performance in lateral-force-resisting applications compared to connectors without this feature.

Why does the HDUE17-SDS4.5 use angled fastening tabs?

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

What type of screws are required to install the HDUE17-SDS4.5, and are they included?

The HDUE17-SDS4.5 installs with 1/4 in. x 4-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws along with a 1 in. anchor bolt. The (28) required SDS screws and a crescent washer are included with the holdown.

What material and corrosion protection does the HDUE17-SDS4.5 have?

The HDUE17-SDS4.5 is made from 10-gauge steel with a G90 zinc galvanized coating, providing a durable level of corrosion resistance suitable for residential wood construction applications.

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