The Simpson Strong-Bolt 2 Wedge Anchor (3/4 in. x 8-1/2 in., Type 316 Stainless Steel) is a wedge-type expansion anchor engineered for high-performance structural anchoring in demanding conditions, including seismic and high-wind environments. 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 - making it a reliable choice for both cracked and uncracked concrete applications. Constructed from Type 316 stainless steel throughout, this anchor delivers long-lasting corrosion resistance across a wide variety of service environments.

Key Features

• Code listed for cracked and uncracked concrete applications - gives engineers and contractors confidence that the anchor meets code requirements across the full range of concrete conditions they encounter on the job.
• Qualified for static and seismic loading conditions (seismic design categories A through F) - covers the broadest range of seismic design categories, so this anchor is specification-ready for projects in virtually any geographic region.
• Dual undercutting embossments on each clip segment - enable secondary expansion if a crack intersects the anchor hole, maintaining load-carrying capacity where standard wedge anchors may lose performance.
• Chamfered top designed to prevent mushrooming during installation - reduces installation errors and rework, keeping projects on schedule and preserving thread integrity for proper nut engagement.
• Suitable for horizontal, vertical, and overhead applications - provides flexibility across a wide range of structural attachment scenarios without requiring a separate anchor specification for each orientation.
• Standard ANSI fractional sizing (3/4 in. diameter) - fits standard fixtures and installs with common drill bit and tool sizes, minimizing specialized tooling requirements on the jobsite.
• Tested per ACI355.2 and AC193 - third-party tested to recognized industry standards, supporting project documentation and inspector approval with an established performance record.
• Made from Type 316 stainless steel throughout - the anchor body, nut, washer, and clip are all Type 316 stainless steel, providing consistent, long-lasting corrosion resistance in wet, coastal, chemical, or other demanding service environments.

Why This Product

• Built for the toughest structural anchoring scenarios - qualification for seismic design categories A through F and code listing for cracked concrete means this wedge anchor can be specified with confidence on critical structural connections where failure is not an option.
• Superior corrosion resistance from anchor to hardware - with every component manufactured from Type 316 stainless steel, this expansion anchor maintains its integrity in corrosive environments where carbon steel or lower-grade stainless anchors would be unsuitable.
• Secondary expansion technology adds a critical safety margin - the dual undercutting embossment design is engineered specifically to sustain load if concrete cracking occurs after installation, a performance advantage that matters most in unpredictable field conditions.
• Installs with standard tools and no special preparation - the 3/4 in. drill bit and 1-1/8 in. wrench requirement means crews can install this concrete anchor using equipment already on hand, reducing downtime and keeping projects moving efficiently.

Specifications

• Size: 3/4 in. x 8-1/2 in.
• Manufacturer: Simpson Strong-Tie
• MPN: STB2-75812S6F8
• Diameter: 3/4 in.
• Length: 8-1/2 in.
• Thread Length: 6 in.
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Anchor Body Material: Type 316 Stainless Steel
• Nut Material: Type 316 Stainless Steel
• Washer Material: Type 316 Stainless Steel
• Clip Material: Type 316 Stainless Steel
• Assembly: Fully Assembled
• Installation: Installs with 3/4 in. drill bit and 1-1/8 in. wrench size
• Packaging: Packs of 8 and Cartons of 16
• Drill Bit Diameter: 3/4 in.

Approved Applications

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

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 its ability to carry load if the hole expands.

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

This anchor installs with a 3/4 in. drill bit and requires a 1-1/8 in. wrench size for installation.

Is this anchor rated for seismic applications?

Yes. The Strong-Bolt 2 is qualified for static and seismic loading conditions, covering seismic design categories A through F. It has been tested per ACI355.2 and AC193.

Why is Type 316 stainless steel used for this anchor?

Type 316 stainless steel provides long-lasting corrosion resistance, making this anchor suitable for a wide variety of service environments where exposure to moisture or corrosive conditions is a concern.

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