The Simpson Strong-Bolt 2 Wedge Anchor is a 3/4 in. x 10 in. fully assembled wedge-type expansion anchor engineered by Simpson for high-performance structural connections in the most demanding concrete and masonry environments. Built from zinc-plated carbon steel, this anchor delivers dependable holding strength under static, seismic, and high-wind loading conditions - making it a go-to fastener for structural, civil, and infrastructure applications where code compliance and long-term load capacity are non-negotiable. 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 anchor to carry load even if the hole expands.

Key Features

• Code listed for cracked and uncracked concrete, and masonry applications - gives contractors and engineers the confidence of verified code compliance across a wide range of base materials and structural conditions.
• Chamfered top designed to prevent mushrooming during installation - protects the anchor head during driving so threads remain clean and fastener integrity is maintained.
• Qualified for static and seismic loading conditions (seismic design categories A through F) - covers the full range of seismic design categories, making this anchor appropriate for high-seismic zones and high-wind regions alike.
• Dual undercutting embossments on each clip segment - enable secondary expansion if cracking occurs at the anchor location, sustaining load-carrying capacity even as concrete conditions change.
• Suitable for horizontal, vertical and overhead applications - provides installation flexibility so a single anchor can serve multiple orientations on the same job site.
• Tested per ACI355.2 and AC193 - independent third-party testing under recognized standards supports use on engineered and permitted projects.
• Installs with a 3/4 in. drill bit - same-size drill bit and anchor diameter simplifies tool selection and reduces setup time on site.

Why This Product

• Built for cracked concrete without sacrificing performance - the secondary expansion mechanism created by the dual undercutting embossments on each clip segment means load capacity is actively maintained even if cracks develop around the anchor after installation, addressing one of the most common failure scenarios in concrete fastening.
• Full seismic category coverage from A through F - unlike anchors qualified only for lower-risk zones, the Strong-Bolt 2 meets requirements for the most stringent seismic and high-wind design categories, reducing the need to specify different products across projects in different regions.
• Versatile installation in any orientation - approved for horizontal, vertical, and overhead use in both cracked and uncracked concrete as well as masonry, this expansion anchor adapts to the full range of structural connection scenarios without requiring separate product selections.
• Chamfered top and fully assembled design streamline field installation - the chamfered top prevents mushrooming during driving while the fully assembled configuration means the anchor arrives job-site ready, reducing handling steps and helping crews work more efficiently.

Specifications

• Size: 3/4 in. x 10 in.
• Brand: Simpson Strong-Tie
• MPN: STB2-75100F8
• Material: Carbon Steel
• Coating / Finish: Zinc Plated
• Diameter: 3/4 in.
• Length: 10 in.
• Thread Length: 6 in.
• Installation Drill Bit: 3/4 in.
• Wrench Size: 1-1/8 in.
• Packaging: Packs of 8 and Cartons of 40

Approved Applications

• Cracked concrete structural connections
• Uncracked concrete structural connections
• Masonry applications
• Horizontal installations
• Vertical installations
• Overhead installations
• Seismic design categories A through F
• High-wind condition installations

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 applications. Its dual undercutting embossments on each clip segment enable secondary expansion should a crack form and intersect the anchor location, significantly increasing its ability to carry load if the hole expands.

What drill bit and wrench size are required for installation?

The Strong-Bolt 2 STB2-75100F8 installs with a 3/4 in. drill bit and requires a 1-1/8 in. wrench size for proper torque application.

What seismic design categories is the Strong-Bolt 2 qualified for?

The Strong-Bolt 2 is qualified for static and seismic loading conditions spanning seismic design categories A through F, making it appropriate for use in the most demanding seismic and high-wind environments.

What testing standards has the Strong-Bolt 2 been evaluated under?

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

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