The Simpson Strong-Bolt 2 Wedge Anchor (3/4 in. x 8-1/2 in., Type 304 Stainless Steel) is a wedge-type expansion anchor engineered by Simpson for high-performance concrete anchoring in the most demanding structural conditions, including seismic and high-wind applications. 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 - a critical advantage for long-term structural reliability. Constructed from Type 304 stainless steel throughout, this concrete wedge anchor delivers long-lasting corrosion resistance across a wide variety of service environments, making it well suited for both interior and exposed exterior installations.

Key Features

• Code listed for cracked and uncracked concrete applications - gives engineers and contractors the flexibility to specify a single anchor across varying concrete conditions without second-guessing compliance.
• Dual undercutting embossments on each clip segment - enable secondary expansion if a crack intersects the anchor location, preserving load-carrying capacity even as the hole expands over time.
• Chamfered top designed to prevent mushrooming during installation - protects the anchor head during driving so the bolt thread remains clean and the nut seats properly without rework.
• Qualified for static and seismic loading conditions (seismic design categories A through F) - meets the most stringent seismic code requirements, making this anchor appropriate for high-seismic zones where lesser anchors cannot be specified.
• Suitable for horizontal, vertical and overhead applications - a single anchor solution handles the full range of concrete fastening orientations on any job site.
• Standard (ANSI) fractional sizes - fits standard fixtures and installs with common drill bit and tool sizes, reducing the need for specialty equipment and keeping installation straightforward.
• Tested per ACI355.2 and AC193 - third-party validated performance gives specifiers and inspectors confidence that the anchor meets recognized industry testing standards.
• Made from Type 304 stainless steel - provides long-lasting corrosion resistance for demanding service environments where carbon steel anchors would degrade prematurely.

Why This Product

• Engineered for worst-case conditions - unlike basic wedge anchors, the Strong-Bolt 2 is specifically qualified for seismic design categories A through F and high-wind conditions, so it meets code in demanding applications where anchor selection is strictly regulated.
• Built-in crack response technology - the dual undercutting embossments on each clip segment actively respond to concrete cracking by triggering secondary expansion, maintaining structural load capacity in situations that would compromise a conventional expansion anchor.
• All-stainless construction for corrosion-critical environments - with the anchor body, nut, washer, and clip all made from stainless steel, this anchor resists corrosion in wet, coastal, chemical, or otherwise aggressive environments where long service life is a priority.
• Installs with standard tools and no special setup - the ANSI fractional 3/4 in. diameter works with a standard 3/4 in. drill bit and a 1-1/8 in. wrench, so crews can complete the installation with common on-hand equipment rather than sourcing specialty tooling.

Specifications

• Size: 3/4 in. x 8-1/2 in.
• MPN: STB2-75812S4F8
• Brand: Simpson Strong-Tie
• Diameter: 3/4 in.
• Length: 8-1/2 in.
• Thread Length: 6 in.
• Material: Type 304 Stainless Steel
• Finish: Type 304 Stainless Steel
• Anchor Body Material: Type 304 Stainless Steel
• Nut Material: Type 304 Stainless Steel
• Washer Material: Type 304 Stainless Steel
• Clip Material: Type 304 or Type 316 Stainless Steel
• Installation Drill Bit Size: 3/4 in.
• Wrench Size: 1-1/8 in.
• Assembly: Fully Assembled
• Testing Standards: ACI355.2 and AC193
• Packaging: Packs of 8 and Cartons of 16

Approved Applications

• Cracked and uncracked concrete anchoring
• Static loading applications
• Seismic loading applications - seismic design categories A through F
• High-wind condition installations
• Horizontal anchor installations
• Vertical anchor installations
• Overhead anchor installations

Frequently Asked Questions

What size drill bit and wrench are required to install this wedge anchor?

This anchor 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 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 its ability 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 high-performance use even in seismic and high-wind conditions.

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 concrete anchor testing and qualification standards.

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