The Simpson Strong-Bolt 2 5/8 in. x 12 in. Wedge Anchor in zinc-plated carbon steel is a wedge-type expansion anchor engineered for high-performance concrete fastening in the most demanding structural environments, including seismic and high-wind conditions. 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 if the hole expands - making it a reliable choice for both cracked and uncracked concrete installations. Tested per ACI355.2 and AC193, this anchor delivers code-compliant performance across a full range of structural connection applications.

Key Features

• Chamfered top designed to prevent mushrooming during installation - keeps the anchor thread clean and undamaged so fastening is secure and reliable from the first set
• Dual undercutting embossments on each clip segment - enable secondary expansion if a crack intersects the anchor location, maintaining load-carrying capacity even in compromised concrete
• Qualified for static and seismic loading conditions covering seismic design categories A through F - meets the broadest range of code requirements, giving engineers and contractors confidence on projects with strict seismic demands
• Suitable for horizontal, vertical, and overhead applications - provides installation flexibility across virtually any structural connection orientation on the jobsite
• Tested per ACI355.2 and AC193 - independently verified performance means the anchor meets recognized industry standards for mechanical expansion anchors in concrete
• Made from zinc-plated carbon steel - provides a corrosion-resistant finish appropriate for standard interior and protected structural applications
• Installs with a 5/8 in. drill bit and 15/16 in. wrench size - straightforward tooling requirements that fit common jobsite equipment, reducing setup time

Why This Product

• Built for seismic and high-wind structural connections - the Strong-Bolt 2 is specifically qualified for seismic design categories A through F, making it one of the few wedge anchors suited to the full spectrum of seismic code requirements without requiring a product substitution on high-stakes projects
• Secondary expansion technology protects load capacity in cracked concrete - the dual undercutting embossments on each clip segment allow the anchor to expand a second time if cracking occurs at the anchor location, a critical safety advantage that standard wedge anchors do not offer
• Verified by independent testing standards - compliance with ACI355.2 and AC193 means performance data is substantiated through recognized third-party protocols, supporting code submissions and inspection approvals with confidence
• Versatile orientation and application compatibility - approved for cracked and uncracked concrete, masonry, and horizontal, vertical, or overhead installations, this anchor adapts to a wide variety of fastening scenarios without requiring multiple anchor types on the same project

Specifications

• Model Number: STB2-621200R10
• Diameter: 5/8 in.
• Length: 12 in.
• Material: Carbon Steel
• Coating: Zinc Plated
• Finish: Zinc Plated
• Installation: Installs with 5/8 in. drill bit and 15/16 in. wrench size
• Packaging: Packs of 10 and Cartons of 100
• Drill Bit Diameter: 5/8 in.

Approved Applications

• Cracked and uncracked concrete installations
• Masonry applications
• Seismic design categories A through F
• High-wind condition structural connections
• Horizontal, vertical, and overhead installations

Frequently Asked Questions

What makes the Strong-Bolt 2 suitable for seismic conditions?

The Strong-Bolt 2 is qualified for static and seismic loading conditions covering seismic design categories A through F. Its dual undercutting embossments on each clip segment 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.

What tools are needed to install the STB2-621200R10?

The Strong-Bolt 2 in this size installs with a 5/8 in. drill bit and a 15/16 in. wrench size. The chamfered top is designed to prevent mushrooming during installation, helping ensure a clean, reliable set.

What orientations can this wedge anchor be installed in?

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

What testing and code standards does the Strong-Bolt 2 meet?

The Strong-Bolt 2 has been tested per ACI355.2 and AC193, and is code listed for cracked and uncracked concrete as well as masonry applications, confirming its compliance with recognized industry performance standards.

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