The Simpson Strong-Bolt 2 3/8 in. x 3-3/4 in. Wedge Anchor in Type 316 Stainless Steel is a high-performance wedge-type expansion anchor built for demanding concrete fastening applications where reliability under load and long-term durability are non-negotiable. Engineered by Simpson for use in seismic and high-wind conditions, this anchor features dual undercutting embossments on each clip segment that enable secondary expansion if a crack forms and intersects the anchor location - helping maintain load-carrying capacity even as conditions change. Whether you are anchoring into cracked or uncracked concrete, horizontally, vertically, or overhead, this stainless-steel wedge anchor is designed to perform where it counts.

Key Features

• Type 316 stainless steel construction throughout - all components deliver long-lasting corrosion resistance across a wide variety of service environments, making this anchor well suited for moisture-exposed and corrosive conditions.
• Dual undercutting embossments on each clip segment - enables secondary expansion if a crack intersects the anchor location, significantly increasing load-carrying capacity in compromised concrete.
• Code listed for cracked and uncracked concrete applications - gives installers and engineers confidence that the anchor meets recognized standards for both condition types without requiring a separate product.
• Qualified for static and seismic loading conditions (seismic design categories A through F) - suitable for projects in the most demanding seismic zones, reducing specification risk on regulated jobsites.
• Suitable for horizontal, vertical, and overhead applications - eliminates the need for multiple anchor types across a single project, simplifying procurement and installation.
• Chamfered top designed to prevent mushrooming during installation - promotes cleaner, more consistent installation and reduces the likelihood of installation errors that could compromise holding strength.
• Standard (ANSI) fractional sizes and installs with a 3/8 in. drill bit and 9/16 in. wrench - fits standard fixtures and common tools already on the jobsite, keeping installation straightforward and efficient.
• Tested per ACI 355.2 and AC193 - independently verified performance gives engineers and inspectors the documentation needed for code-compliant installations.

Why This Product

• Built for the toughest seismic and high-wind requirements - qualified across seismic design categories A through F and optimized for high-wind conditions, this wedge anchor is one of the few expansion anchors capable of meeting code requirements on the most structurally demanding projects.
• Crack-resistant load performance sets it apart - the dual undercutting embossment design actively responds to concrete cracking by triggering secondary expansion, protecting load capacity in scenarios where a standard wedge anchor would be compromised.
• Full Type 316 stainless steel assembly for long-term service - with every component - body, nut, washer, and clip - made from Type 316 stainless steel, this anchor resists corrosion in environments where carbon steel or lower-grade stainless anchors would deteriorate prematurely.
• Versatile installation orientation with no specialty tooling required - approved for horizontal, vertical, and overhead use and compatible with standard drill bit and wrench sizes, this anchor reduces complexity whether you are working on a single fixture or a large-scale structural fastening project.

Specifications

• Model Number: STB2-37334S6F50
• Coating/Material: Type 316 Stainless Steel
• Size: 3/8 in. x 3-3/4 in.
• Drill Bit Diameter: 3/8 in.
• Thread Length: 2-5/16 in.
• 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
• Anchor Type: Wedge-Type Expansion Anchor
• Packaging: Packs of 50 and Cartons of 250

Approved Applications

• Cracked concrete installations
• Uncracked concrete installations
• Seismic zone applications
• High-wind condition applications
• Corrosive or moisture-exposed service environments

Frequently Asked Questions

Is the Strong-Bolt 2 STB2-37334S6F50 suitable for use in cracked concrete?

Yes. The Strong-Bolt 2 wedge anchor is code listed for both cracked and uncracked concrete applications. Its dual undercutting embossments on each clip segment allow for secondary expansion should a crack form and intersect the anchor location, helping it maintain load-carrying capacity even if the hole expands.

Why is Type 316 stainless steel used for all components of this anchor?

All components - including the anchor body, nut, washer, and clip - are made from Type 316 stainless steel to provide long-lasting corrosion resistance across a wide variety of service environments. This makes the anchor particularly well suited for applications where exposure to moisture, chemicals, or other corrosive conditions is expected.

What drill bit diameter is required to install the STB2-37334S6F50?

A 3/8-inch diameter drill bit is required to install this anchor, matching the 3/8-inch anchor diameter for a proper fit in the concrete substrate.

Is this anchor rated for seismic and high-wind applications?

Yes. The Strong-Bolt 2 is an optimal choice for high-performance use even in seismic and high-wind conditions, and it is code listed to meet the demands of these challenging structural environments.

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