The Simpson HTT4 Heavy Tension Tie is a single-piece formed connector engineered by Simpson to resist medium tension loads and deliver high-strength, post-pour, concrete-to-steel connections. Built from 11-gauge steel with a four-ply formed seat and a G90 galvanized finish, this heavy tension tie is designed to perform in demanding structural applications where a secure, rivet-free connection between wood framing and concrete is required. Whether anchoring walls in new residential construction or reinforcing existing structures, the HTT4 provides a reliable, washer-free solution compatible with both cast-in-place and post-installed anchor bolts.

Key Features

• Four-ply formed steel seat - concentrates material where load is greatest, increasing tension capacity beyond what a standard single-thickness seat provides
• Compatible with cast-in-place or post-installed anchor bolts - gives contractors the flexibility to use the same connector on new pours or retrofit projects without sourcing a different product
• No anchor bolt washers required - the formed seat design eliminates a separate hardware component, reducing installation steps and overall material costs
• Rivet-free, single-piece construction - fewer parts mean fewer potential failure points and a more straightforward installation process
• 11-gauge steel with G90 galvanized coating - provides the structural thickness and corrosion resistance needed for long-term performance in exposed or treated-lumber environments
• Installs with #10 screws or common nails - accepts Simpson Strong-Drive SD Connector screws or standard nails, giving crews the option to use tools already on the job site
• Suited for both retrofit and new construction - a single connector model covers a wide range of project types, simplifying procurement and inventory management

Why This Product

• Simplified installation with fewer components - because anchor bolt washers are not required and the connector is a single formed piece with no rivets, crews spend less time managing hardware and more time completing the connection
• Versatile anchor bolt compatibility - the ability to work with both cast-in-place and post-installed anchor bolts makes this heavy tension tie a practical choice across a broad range of structural scenarios, from ground-up framing to seismic retrofits
• Proven corrosion resistance - the G90 galvanized finish is applied to 11-gauge steel, helping the connector hold up in conditions where moisture or treated lumber chemicals could degrade lesser coatings over time
• High-capacity design in a compact profile - the four-ply formed seat maximizes tension load resistance within a 2-1/2 in. wide by 12-3/8 in. long footprint, making it well suited for tight framing bays where space for hardware is limited

Specifications

• Model Number: HTT4
• Length: 12-3/8 in.
• Width: 2-1/2 in.
• Gauge: 11
• Anchor Rod Diameter: 5/8 in.
• Coating: Zinc Galvanized, G90
• Finish: Zinc Galvanized, G90
• Install With: (1) 5/8-in. anchor bolt AND (18) 0.148 x 1-1/2-in. nails, 0.162 x 2-1/2-in. nails or #10 x 1-1/2-in. Strong-Drive SD Connector screws (sold separately)
• Country of Origin: United States

Approved Applications

• High-strength, post-pour, concrete-to-steel connections
• Retrofit projects requiring post-installed anchor bolt connections
• New construction requiring cast-in-place anchor bolt connections
• Medium tension load resistance applications

Downloads and Resources

• Fasteners required. View Specifications

Frequently Asked Questions

Does the HTT4 require anchor bolt washers?

No. The HTT4 is specifically designed so that anchor bolt washers are not required, simplifying installation and reducing hardware needs.

What fasteners are required to install the HTT4?

Installation requires (1) 5/8-in. anchor bolt AND (18) 0.148 x 1-1/2-in. nails, 0.162 x 2-1/2-in. nails, or #10 x 1-1/2-in. Strong-Drive SD Connector screws.

Can the HTT4 be used with post-installed anchor bolts?

Yes. The HTT4 can be installed with either cast-in-place or post-installed anchor bolts, making it suitable for both new construction and retrofit applications.

What is the gauge and finish of the HTT4?

The HTT4 is made from 11-gauge steel and features a Zinc Galvanized, G90 coating that provides corrosion resistance for long-term durability.

Note: Product dimensions and/or screw or bolt holes may differ from picture. Please see item description for specifications.