The Simpson Strong-Bolt 2 5/8 in. x 5 in. Wedge Anchor is a wedge-type expansion anchor engineered by Simpson for high-performance structural anchoring in cracked and uncracked concrete as well as masonry. 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 Strong-Bolt 2 to carry load if the hole expands. With qualification for static and seismic loading conditions across seismic design categories A through F, this anchor is a dependable solution for demanding structural connections in high-wind and seismic environments.

Key Features

• Code listed for cracked and uncracked concrete and masonry - gives engineers and installers confidence that the anchor meets recognized code requirements across the widest range of common base materials.
• Dual undercutting embossments on each clip segment - enable secondary expansion if a crack intersects the anchor location, maintaining load-carrying capacity where standard wedge anchors may underperform.
• Chamfered top design - prevents mushrooming during installation, protecting the threads and making nut removal straightforward after setting.
• Qualified for seismic design categories A through F - covers the full spectrum of seismic zones, making this anchor suitable for projects in virtually any region with seismic or high-wind design requirements.
• Suitable for horizontal, vertical, and overhead applications - provides flexibility for installers working in varied orientations without requiring a different anchor product for each condition.
• Tested per ACI355.2 and AC193 - independently verified compliance with recognized industry standards for wedge-type anchors, supporting design approval and code submittals.
• Zinc-plated carbon steel construction - provides a corrosion-resistant finish appropriate for general interior structural and concrete anchoring applications.
• Installs with a 5/8 in. drill bit and 15/16 in. wrench - straightforward tooling requirements minimize setup time and keep installation efficient on the job site.

Why This Product

• Built for the harshest structural conditions - qualification for seismic design categories A through F and suitability for high-wind connections means this wedge anchor handles the most demanding code-required applications without substitution.
• Secondary expansion technology protects load capacity - the dual undercutting embossments on each clip segment are a design feature unique to the Strong-Bolt 2, giving the anchor a measurable performance advantage in cracked concrete over conventional expansion anchors.
• Broad application versatility reduces on-site complexity - a single anchor model covers cracked concrete, uncracked concrete, and masonry in horizontal, vertical, and overhead orientations, simplifying procurement and reducing the need to stock multiple anchor types.
• Independently tested and code listed - ACI355.2 and AC193 testing provides the documentation that engineers and inspectors require, making project approval and field verification straightforward.

Specifications

• Size: 5/8 in. x 5 in.
• MPN: STB2-62500F20
• Brand: Simpson Strong-Tie
• Diameter: 5/8 in.
• Length: 5 in.
• Thread Length: 2-15/16 in.
• Material: Carbon Steel
• Coating: Zinc Plated
• Finish: Zinc Plated
• Drill Bit Size: 5/8 in.
• Wrench Size: 15/16 in.
• Packaging: Packs of 20 and Cartons of 80

Approved Applications

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

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, as well as masonry applications. Its dual undercutting embossments on each clip segment enable secondary expansion should a crack form and intersect the anchor location, significantly increasing the ability of Strong-Bolt 2 to carry load if the hole expands.

What seismic design categories is this anchor 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 the most demanding seismic zones.

What tools are needed to install the STB2-62500F20?

This anchor installs with a 5/8 in. drill bit and requires a 15/16 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 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.