The Simpson Strong-Bolt 2 Wedge Anchor in 3/8 in. x 2 3/4 in., zinc-plated carbon steel is a wedge-type expansion anchor engineered for high-performance anchoring in both cracked and uncracked concrete. Built to perform under demanding seismic and high-wind conditions, 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 if the hole expands. Tested per ACI355.2 and AC193, the Strong-Bolt 2 delivers reliable, code-compliant performance across a wide range of structural fastening applications.

Key Features

• Chamfered top - prevents mushrooming during installation, making seating cleaner and reducing the risk of installation damage to the anchor head.
• Dual undercutting embossments on each clip segment - allow secondary expansion if a crack intersects the anchor location, maintaining load-carrying capacity even as conditions change in the base material.
• Qualified for static and seismic loading conditions (seismic design categories A through F) - gives engineers and contractors the confidence to specify this anchor on projects with strict seismic requirements.
• Suitable for horizontal, vertical, and overhead applications - provides installation flexibility across a broad range of concrete fastening orientations and jobsite scenarios.
• Tested per ACI355.2 and AC193 - ensures the anchor meets recognized industry standards for both static and seismic performance in cracked and uncracked concrete.
• Zinc-plated carbon steel construction - provides a corrosion-resistant finish appropriate for standard interior and protected concrete anchoring applications.

Why This Product

• Built for seismic and high-wind zones - the Strong-Bolt 2's dual undercutting embossment design and qualification across seismic design categories A through F make it a dependable choice for structural anchoring in the most demanding code environments.
• Secondary expansion protects performance in cracked concrete - unlike standard wedge anchors, the clip design actively responds to crack formation at the anchor location, helping maintain load capacity when the base material is compromised.
• Versatile installation compatibility - approved for use in cracked and uncracked concrete, masonry, and all orientations (horizontal, vertical, and overhead), reducing the need to source different anchors for different conditions on the same project.
• Third-party tested to recognized standards - compliance with ACI355.2 and AC193 simplifies the specification and approval process for engineers, inspectors, and contractors working on code-governed structures.

Specifications

• Size: 3/8 in. x 2-3/4 in.
• MPN: STB2-37234F50
• Brand: Simpson Strong-Tie
• Diameter: 3/8 in.
• Length: 2-3/4 in.
• Thread Length: 1-5/16 in.
• Material: Carbon Steel
• Coating: Zinc Plated
• Finish: Zinc Plated
• Installation Drill Bit: 3/8 in.
• 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 makes the Strong-Bolt 2 suitable for seismic conditions?

The Strong-Bolt 2 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 anchor's ability to carry load if the hole expands, and it is qualified for static and seismic loading conditions covering seismic design categories A through F.

What drill bit size is required to install this wedge anchor?

The Strong-Bolt 2 in this 3/8 in. diameter size installs with a 3/8 in. drill bit and requires a 9/16 in. wrench size for tightening.

What testing 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 both static and seismic loading conditions in cracked and uncracked concrete.

In what material options is the Strong-Bolt 2 available?

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 exposure and corrosion resistance requirements.

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