Product Features
Product Description
Simpson HDUE9-SDS3.5 HDUE 17-3/8 in. 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. Its predeflected seat design minimizes deflection under load, while angled fastening and an overlapping back plate work together to maximize load capacity and help prevent post splitting - making it a dependable solution for modern residential structural demands.
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: 17-3/8 in.
- Made from 12-gauge steel; galvanized (G90) for corrosion resistance
Specifications
- Model No.: HDUE9-SDS3.5
- Height: 17-3/8 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 7/8 in. anchor bolt and (16) 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) HDUE9-SDS3.5 Galvanized Predeflected Holdown, (16) 1/4 in. x 3-1/2 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 HDUE9-SDS3.5?
- The predeflected seat is specifically engineered to reduce deflection under load, which helps maintain the structural integrity and performance of the holdown connection during lateral force events.
- Why does this holdown use angled fastening instead of straight fastener installation?
- The angled fastening tabs help drive the fastener at a 45 deg. angle, which engages the screws in tension for higher load capacity. This approach reduces the total number of screws required while delivering superior performance compared to straight fastener installation.
- What type of fasteners are used to install the HDUE9-SDS3.5, and are they included?
- The holdown installs with 1/4 in. x 3-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws along with a 7/8 in. anchor bolt. The (16) SDS screws and (1) crescent washer are included with the holdown.
- What material and corrosion protection does the HDUE9-SDS3.5 feature?
- The HDUE9-SDS3.5 is made from 12-gauge steel and features a G90 zinc galvanized coating, providing strong corrosion resistance suitable for residential construction applications.
Note: Product dimensions and/or screw or bolt holes may differ from picture.
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