The Simpson Strong-Bolt 2 Wedge Anchor (3/8 in. x 3 in.) is a wedge-type expansion anchor engineered by Simpson for high-performance anchoring in demanding structural applications, including seismic and high-wind conditions. Built from zinc-plated carbon steel, this fully assembled anchor features dual undercutting embossments on each clip segment that enable secondary expansion should a crack form and intersect the anchor location - significantly increasing the anchor's ability to carry load if the hole expands. Code listed for cracked and uncracked concrete as well as masonry, it delivers reliable holding strength across horizontal, vertical, and overhead installations and has been tested per ACI355.2 and AC193.

Key Features

• Dual undercutting embossments on each clip segment - allow secondary expansion if a crack intersects the anchor, helping maintain load capacity even when the hole expands due to cracking.
• Code listed for cracked and uncracked concrete, and masonry applications - gives contractors and engineers the documentation needed to meet building code requirements across a wide range of base materials.
• Chamfered top designed to prevent mushrooming during installation - preserves the integrity of the bolt head so the anchor seats cleanly and correctly every time.
• Qualified for static and seismic loading conditions, seismic design categories A through F - makes this anchor a dependable choice for projects in high-seismic zones where performance documentation is required.
• Suitable for horizontal, vertical, and overhead applications - provides installation flexibility so one anchor model covers multiple orientations on the same job site.
• Tested per ACI355.2 and AC193 - ensures performance is backed by recognized industry test standards, supporting engineering approval and project submittals.
• Installs with a 3/8 in. drill bit and 9/16 in. wrench - straightforward tooling requirements mean faster setup with common equipment already on site.

Why This Product

• Built for the toughest structural conditions - qualified for seismic design categories A through F and high-wind applications, this wedge anchor is engineered to perform where ordinary anchors may fall short, making it a sound choice for code-critical concrete anchoring projects.
• Self-compensating in cracked concrete - the dual undercutting embossments on each clip segment provide secondary expansion if cracking occurs at the anchor location, reducing the risk of load loss and helping structures maintain integrity over time.
• Versatile across applications and orientations - code listed for cracked concrete, uncracked concrete, and masonry, and approved for horizontal, vertical, and overhead use, this anchor reduces the need to stock multiple anchor types for different job conditions.
• Confidence through independent testing - compliance with ACI355.2 and AC193 test standards gives engineers, inspectors, and project managers the third-party verification needed to approve and specify this anchor with confidence.

Specifications

• Size: 3/8 in. x 3 in.
• Manufacturer Part Number (MPN): STB2-37300F50
• Brand: Simpson Strong-Tie
• Anchor Type: Wedge-Type Expansion Anchor
• Material: Carbon Steel
• Coating / Finish: Zinc Plated
• Diameter: 3/8 in.
• Length: 3 in.
• Thread Length: 1-9/16 in.
• Required Drill Bit Size: 3/8 in.
• Wrench Size: 9/16 in.
• Packaging: Packs of 50 and Cartons of 250

Approved Applications

• Cracked concrete anchoring
• Uncracked concrete anchoring
• Masonry anchoring
• Horizontal installations
• Vertical installations
• Overhead installations
• Seismic design categories A through F
• Static and seismic loading conditions
• High-wind structural applications

Frequently Asked Questions

Is the Strong-Bolt 2 suitable for use in cracked concrete?

Yes. The Strong-Bolt 2 is code listed for both cracked and uncracked concrete, as well as masonry applications. Its dual undercutting embossments on each clip segment allow for secondary expansion if a crack forms and intersects the anchor location, helping the anchor maintain load capacity even if the hole expands.

What tools are needed to install the STB2-37300F50?

Installation requires a 3/8 in. drill bit to bore the hole and a 9/16 in. wrench to tighten the anchor. The chamfered top is designed to prevent mushrooming of the bolt head during the installation process.

Is this anchor approved for seismic applications?

Yes. The Strong-Bolt 2 is qualified for static and seismic loading conditions, covering seismic design categories A through F. It has been tested per ACI355.2 and AC193, making it suitable for high-performance anchoring in seismic and high-wind conditions.

Can this anchor be used for overhead or horizontal installations?

Yes. The Strong-Bolt 2 is suitable for horizontal, vertical, and overhead applications, providing versatility across a wide range of structural anchoring scenarios.

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