The Simpson Strong-Bolt 2 Wedge Anchor (3/8 in. x 5 in., Zinc Plated) by Simpson is a wedge-type expansion anchor engineered for high-performance concrete and masonry anchoring in some of the most demanding structural environments. Built from zinc-plated carbon steel, this anchor is optimized for use in seismic and high-wind conditions, and 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 even when the hole expands. Whether you are anchoring into cracked concrete, uncracked concrete, or masonry, the Strong-Bolt 2 delivers code-listed reliability for static and seismic loading conditions across seismic design categories A through F.

Key Features

• Code listed for cracked concrete, uncracked concrete, and masonry applications - gives contractors and engineers the code compliance documentation needed for permitted and inspected work across a wide range of substrates.
• Dual undercutting embossments on each clip segment - enable secondary expansion if a crack intersects the anchor location, helping maintain load-carrying capacity even as concrete conditions change over time.
• Qualified for seismic design categories A through F - suitable for static and seismic loading conditions in high-seismic and high-wind zones, making this anchor appropriate for structurally critical installations.
• Chamfered top design - prevents mushrooming during installation, reducing the risk of installation damage and ensuring a clean, consistent set every time.
• Suitable for horizontal, vertical, and overhead applications - versatile orientation capability means one anchor solution works across multiple installation scenarios on the same jobsite.
• Tested per ACI355.2 and AC193 - independently verified performance standards give engineers and inspectors confidence in published load values and anchor behavior.
• Zinc-plated carbon steel construction - provides a corrosion-resistant finish appropriate for standard interior and protected concrete anchoring applications.

Why This Product

• Engineered for cracked concrete without a separate product - the dual undercutting embossment design allows the Strong-Bolt 2 to maintain load performance even after cracking occurs, eliminating the need to specify a different anchor for potentially cracked substrates.
• Full seismic category coverage from A through F - few wedge anchors cover the entire range of seismic design categories, making this a dependable choice for projects in high-seismic regions where code compliance is non-negotiable.
• Multi-orientation approval for real-world flexibility - with code-listed approval for horizontal, vertical, and overhead installations, this anchor adapts to varied structural attachment scenarios without requiring additional product evaluation.
• Straightforward installation with standard tooling - installs with a 3/8 in. drill bit and a 9/16 in. wrench, meaning no specialty equipment is required, helping keep installation efficient and consistent across a crew.

Specifications

• Size: 3/8 in. x 5 in.
• MPN: STB2-37500F50
• Brand: Simpson Strong-Tie
• Material: Carbon Steel
• Coating: Zinc Plated
• Finish: Zinc Plated
• Diameter: 3/8 in.
• Length: 5 in.
• Thread Length: 3-9/16 in.
• Install With: 3/8 in. drill bit and 9/16 in. wrench size
• Packaging: Packs of 50 and Cartons of 200
• Drill Bit Diameter: 3/8 in.

Approved Applications

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

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 the anchor's ability to carry load if the hole expands.

What drill bit and wrench size are required to install the STB2-37500F50?

The Strong-Bolt 2 STB2-37500F50 installs with a 3/8 in. drill bit and requires a 9/16 in. wrench size for proper installation.

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

The Strong-Bolt 2 is qualified for static and seismic loading conditions covering seismic design categories A through F, making it suitable for high-performance use in seismic and high-wind conditions.

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

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.

Note: Product dimensions and/or thread length may differ from picture. Please refer to the specifications listed above for accurate measurements.