The Simpson Strong-Bolt 2 Wedge Anchor, 3/8 in. x 7 in. is a wedge-type expansion anchor engineered for high-performance structural connections in both cracked and uncracked concrete. Built from zinc-plated carbon steel, this anchor is designed to maintain reliable holding power under demanding conditions, including seismic events and high-wind loading. Dual undercutting embossments on each clip segment enable secondary expansion should a crack form and intersect the anchor location, significantly increasing the ability of the Strong-Bolt 2 to carry load if the hole expands - a critical advantage in real-world structural environments where concrete integrity can change over time.

Key Features

• Chamfered top - prevents mushrooming during installation, keeping the anchor properly seated and reducing the risk of installation errors that could compromise holding strength.
• Dual undercutting embossments on each clip segment - enable secondary expansion if a crack intersects the anchor location, allowing the anchor to continue carrying load even as hole conditions change.
• Qualified for static and seismic loading conditions, seismic design categories A through F - gives engineers and contractors confidence that this anchor meets code requirements across the full range of seismic zones, including the most demanding high-seismic regions.
• Suitable for horizontal, vertical, and overhead applications - provides installation flexibility across a wide variety of concrete anchoring tasks without requiring different hardware for different orientations.
• Tested per ACI355.2 and AC193 - independent third-party testing standards verify performance in both cracked and uncracked concrete, supporting use on projects where documentation and compliance matter.
• Zinc-plated carbon steel construction - provides a corrosion-resistant finish suitable for standard interior and protected concrete anchoring applications.
• Installs with a 3/8 in. drill bit and 9/16 in. wrench - straightforward tooling requirements mean no specialty equipment is needed, keeping installation efficient on the job site.

Why This Product

• Built for seismic and high-wind environments - the Strong-Bolt 2 is qualified for seismic design categories A through F, making it one of the few wedge anchors suitable for structural connections in the most demanding load conditions without requiring a product upgrade or substitution.
• Secondary expansion protects performance in cracked concrete - the dual undercutting embossment design means that if cracking occurs at the anchor point, the anchor actively responds by expanding further rather than losing grip, providing a meaningful safety margin that standard expansion anchors do not offer.
• Verified by rigorous independent testing - compliance with ACI355.2 and AC193 means performance data is backed by recognized industry standards, which supports use on inspected, permitted, and engineered projects where documentation is required.
• Versatile installation orientation - approved for horizontal, vertical, and overhead concrete anchoring, this wedge anchor covers a broad range of structural and fastening applications with a single, consistent product.

Specifications

• Size: 3/8 in. x 7 in.
• MPN: STB2-37700F50
• Brand: Simpson Strong-Tie
• Diameter: 3/8 in.
• Length: 7 in.
• Thread Length: 5-9/16 in.
• Material: Carbon Steel
• Coating / Finish: Zinc Plated
• Required Drill Bit: 3/8 in.
• Required Wrench Size: 9/16 in.
• Packaging: Packs of 50 and Cartons of 200

Approved Applications

• Cracked and uncracked concrete installations
• Seismic design categories A through F
• High-wind structural connections
• Horizontal anchor installations
• Vertical anchor installations
• Overhead anchor installations

Frequently Asked Questions

What size drill bit is required to install the Strong-Bolt 2 STB2-37700F50?

This anchor installs with a 3/8 in. drill bit. A 9/16 in. wrench is also required to properly tighten the nut during installation.

Is this anchor rated for use in seismic zones?

Yes. The Strong-Bolt 2 is qualified for static and seismic loading conditions, covering seismic design categories A through F, making it suitable for high-seismic and high-wind environments.

Can the Strong-Bolt 2 be used in cracked concrete?

Yes. The dual undercutting embossments on each clip segment enable secondary expansion should a crack form and intersect the anchor location, which significantly increases the ability of the Strong-Bolt 2 to carry load if the hole expands. It has been tested per ACI355.2 and AC193 for both cracked and uncracked concrete.

What orientations are approved for installing this wedge anchor?

The Strong-Bolt 2 STB2-37700F50 is suitable for horizontal, vertical, and overhead applications, providing flexibility for a wide range of structural connection scenarios.

Note: Product dimensions and/or thread length may differ from picture. Please see the item specifications above for exact measurements.