The Simpson Strong-Bolt 2 Wedge Anchor (3/4 in. x 8-1/2 in., Zinc Plated) is a wedge-type expansion anchor engineered for high-performance structural connections in both cracked and uncracked concrete. Built from zinc-plated carbon steel, it is an optimal choice for demanding applications - including seismic and high-wind conditions - where reliable load transfer is critical. 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 if the hole expands.

Key Features

• Chamfered top - prevents mushrooming during installation, helping keep the anchor flush and installation clean without damaging the bolt head.
• Qualified for static and seismic loading conditions (seismic design categories A through F) - gives engineers and contractors confidence that this anchor meets code requirements across the full range of seismic risk zones and high-wind structural applications.
• Suitable for horizontal, vertical, and overhead applications - provides installation flexibility to tackle a wide variety of structural anchoring scenarios without switching products.
• Tested per ACI355.2 and AC193 - confirms code-listed performance in cracked and uncracked concrete as well as masonry, reducing approval risk on regulated projects.
• Dual undercutting embossments on each clip segment - enable secondary expansion if a crack intersects the anchor, maintaining load-carrying capacity even as substrate conditions change.
• Zinc-plated carbon steel construction - provides a corrosion-resistant finish suitable for standard interior and protected structural applications.

Why This Product

• Built for seismic and high-wind environments - unlike basic wedge anchors, the Strong-Bolt 2 is specifically qualified for seismic design categories A through F, making it a dependable choice for structurally critical concrete fastening where code compliance is non-negotiable.
• Secondary expansion technology protects load capacity - the dual undercutting embossments on each clip segment allow the anchor to continue performing even if a crack forms at the anchor location, a meaningful safety advantage in dynamic or aging concrete structures.
• Versatile installation orientation - rated for horizontal, vertical, and overhead use, this expansion anchor adapts to the demands of complex structural projects without requiring multiple anchor types on the same job.
• Independently tested to recognized industry standards - evaluation per ACI355.2 and AC193 means third-party verified performance data is available to support engineering submittals, inspections, and building permit approvals.

Specifications

• Size: 3/4 in. x 8-1/2 in.
• MPN: STB2-75812F8
• Brand: Simpson Strong-Tie
• Diameter: 3/4 in.
• Length: 8-1/2 in.
• Thread Length: 6 in.
• Material: Carbon Steel
• Coating: Zinc Plated
• Finish: Zinc Plated
• Installation Drill Bit: 3/4 in.
• Wrench Size: 1-1/8 in.
• Packaging: Packs of 8 and Cartons of 80

Approved Applications

• Cracked and uncracked concrete applications
• Masonry applications
• Seismic design categories A through F
• High-wind structural conditions
• Horizontal installations
• Vertical installations
• Overhead installations

Frequently Asked Questions

What size drill bit and wrench are required to install the Strong-Bolt 2?

The Strong-Bolt 2 (STB2-75812F8) installs with a 3/4 in. drill bit and requires a 1-1/8 in. wrench size for proper installation.

Is the Strong-Bolt 2 suitable for use in seismic conditions?

Yes. The Strong-Bolt 2 is qualified for both static and seismic loading conditions, covering seismic design categories A through F, making it an optimal choice for high-performance applications in seismic and high-wind environments.

Can the Strong-Bolt 2 be used for overhead or horizontal installations?

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

What testing standards has the Strong-Bolt 2 been evaluated under?

The Strong-Bolt 2 has been tested per ACI355.2 and AC193, confirming its performance for code-listed use in cracked and uncracked concrete as well as masonry applications.

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