The Simpson Strong-Bolt 2 3/8 in. x 2 1/4 in. Wedge Anchor is a wedge-type expansion anchor engineered for high-performance concrete and masonry fastening in the most demanding structural conditions. Built from zinc-plated carbon steel, this anchor features dual undercutting embossments on each clip segment that enable secondary expansion should a crack form and intersect the anchor location - significantly increasing its ability to carry load even as hole conditions change. Whether the application calls for fastening into cracked or uncracked concrete, working overhead, or anchoring in a high-wind or seismic zone, the Simpson Strong-Bolt 2 is engineered to hold.

Key Features

• Chamfered top - prevents mushrooming during installation, keeping the anchor flush and correctly seated without deforming the fastener head.
• Dual undercutting embossments on each clip segment - enable secondary expansion if a crack intersects the anchor location, maintaining load-carrying capability even when hole conditions deteriorate.
• Qualified for static and seismic loading conditions (seismic design categories A through F) - gives builders and engineers confidence that the anchor meets the requirements for high-seismic and high-wind applications.
• Suitable for horizontal, vertical, and overhead applications - provides installation flexibility across a wide range of structural fastening scenarios without requiring a different anchor for each orientation.
• Tested per ACI 355.2 and AC193 - independent third-party testing standards verify performance, supporting code-compliance on commercial and residential projects.
• Zinc-plated carbon steel construction - provides a corrosion-resistant finish appropriate for interior concrete and masonry fastening applications.
• Installs with a 3/8 in. drill bit and 9/16 in. wrench - straightforward tooling requirements mean faster setup and no specialized equipment needed on the job site.

Why This Product

• Built for cracked concrete without sacrificing load performance - the secondary expansion mechanism created by the dual undercutting embossments means this wedge anchor continues to perform structurally even if a concrete crack develops at the anchor point, a critical advantage in long-term structural applications.
• Seismic and high-wind qualified across all design categories - with approval covering seismic design categories A through F, this expansion anchor is an optimal choice for projects in regions with strict lateral force requirements, removing the guesswork from anchor selection.
• Versatile orientation capability - approved for horizontal, vertical, and overhead concrete fastening, this anchor eliminates the need to source separate products for different installation angles on the same project.
• Backed by recognized industry testing standards - compliance with ACI 355.2 and AC193 provides the documentation engineers and inspectors need, making it easier to get projects approved and keep work on schedule.

Specifications

• Size: 3/8 in. x 2-1/4 in.
• MPN: STB2-37214R50
• Brand: Simpson Strong-Tie
• Anchor Type: Wedge-type expansion anchor
• Diameter: 3/8 in.
• Length: 2-1/4 in.
• Thread Length: 1 in.
• Material: Carbon Steel
• Coating/Finish: Zinc Plated
• Anchor Body Material: Carbon Steel
• Nut Material: Carbon Steel ASTM A 563, Grade A
• Washer Material: Carbon Steel ASTM F844
• Clip Material: Carbon Steel ASTM A 568
• Required Drill Bit Size: 3/8 in.
• Required Wrench Size: 9/16 in.
• Packaging: Packs of 50 and Cartons of 250

Approved Applications

• Cracked and uncracked concrete applications
• Masonry applications
• Seismic design categories A through F
• High-wind conditions
• Horizontal installations
• Vertical installations
• Overhead installations

Frequently Asked Questions

What tools are needed to install the Simpson Strong-Bolt 2 wedge anchor?

Installation requires a 3/8 in. drill bit to prepare the hole and a 9/16 in. wrench to tighten the anchor in place.

Is the Strong-Bolt 2 suitable for use in seismic zones?

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

What makes the Strong-Bolt 2 perform well in cracked concrete?

The anchor features dual undercutting embossments on each clip segment that enable secondary expansion should a crack form and intersect the anchor location. This significantly increases the ability of the Strong-Bolt 2 to carry load even if the hole expands due to cracking.

What standards has the Strong-Bolt 2 been tested to?

The Strong-Bolt 2 has been tested per ACI355.2 and AC193, ensuring compliance with recognized industry standards for wedge-type expansion anchors in both cracked and uncracked concrete and masonry applications.

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