The Simpson Strong-Bolt 2 Wedge Anchor (1/4 in. x 1-3/4 in., Zinc Plated) is a wedge-type expansion anchor from Simpson engineered for high-performance structural fastening in both cracked and uncracked concrete. 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 - making it a dependable choice for seismic and high-wind connection applications. Built from zinc-plated carbon steel and tested per ACI355.2 and AC193, this concrete anchor is suitable for horizontal, vertical, and overhead installations across seismic design categories A through F.

Key Features

• Chamfered top design - prevents mushrooming during installation, protecting the anchor head and helping ensure a clean, secure set every time
• Dual undercutting embossments on each clip segment - enable secondary expansion if a crack intersects the anchor location, maintaining load-carrying capacity even as the hole expands
• Qualified for static and seismic loading conditions (seismic design categories A through F) - gives engineers and contractors confidence for use in the most demanding seismic and high-wind structural applications
• Suitable for horizontal, vertical, and overhead applications - offers installation flexibility across a wide range of concrete fastening orientations and job-site conditions
• Tested per ACI355.2 and AC193 - meets recognized industry standards for mechanical anchors in concrete, supporting code-compliant project submissions
• Zinc-plated carbon steel construction - provides corrosion resistance suitable for standard interior concrete anchoring applications

Why This Product

• Built for seismic and high-wind environments - the Strong-Bolt 2 is specifically qualified for seismic design categories A through F, making it one of the few wedge anchors suited for the full range of seismic structural fastening requirements
• Secondary expansion technology protects load capacity in cracked concrete - the dual undercutting embossment design actively responds to crack formation at the anchor location, helping the anchor maintain its holding strength rather than losing it when conditions change
• Versatile installation orientation - approved for horizontal, vertical, and overhead concrete fastening, this expansion anchor adapts to varied structural connection scenarios without requiring a different anchor for each application
• Third-party tested to ACI355.2 and AC193 - independent testing to established concrete anchor standards gives specifiers and inspectors the documentation they need for code-compliant installation on commercial and residential projects alike

Specifications

• Size: 1/4 in. x 1-3/4 in.
• MPN: STB2-25134F100
• Brand: Simpson Strong-Tie
• Diameter: 1/4 in.
• Length: 1-3/4 in.
• Thread Length: 1-5/16 in.
• Material: Carbon Steel
• Coating: Zinc Plated
• Finish: Zinc Plated
• Installation: Installs with 1/4 in. drill bit and 7/16 in. wrench size
• Packaging: Packs of 100 and Cartons of 500
• Drill Bit Diameter: 1/4 in.

Approved Applications

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

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 Strong-Bolt 2 wedge anchor?

The Strong-Bolt 2 installs with a 1/4 in. drill bit and requires a 7/16 in. wrench size for tightening.

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 industry standards for mechanical anchors in concrete.

What material and finish options are available for the Strong-Bolt 2?

The Strong-Bolt 2 is available in zinc-plated carbon steel, mechanically galvanized carbon steel, and Type 304 and Type 316 stainless steel, allowing selection based on environmental and corrosion-resistance requirements.

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