The Simpson Strong-Bolt 2 3/8 in. x 5 in. Wedge Anchor in Type 316 Stainless Steel is a wedge-type expansion anchor engineered for high-performance concrete fastening in the most demanding structural and environmental conditions. 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 anchor to carry load if the hole expands - making it an optimal choice for seismic and high-wind applications. All components, including the anchor body, nut, washer, and clip, are constructed from Type 316 stainless steel for long-lasting corrosion resistance across a wide variety of service environments.

Key Features

• Code listed for cracked and uncracked concrete applications - gives installers and engineers the confidence to use this anchor across a broad range of structural conditions without seeking additional approval.
• Dual undercutting embossments on each clip segment - enable secondary expansion if a crack intersects the anchor location, helping maintain load-carrying capacity even as conditions change.
• Qualified for seismic design categories A through F and static loading conditions - suitable for projects in high-seismic and high-wind zones where anchor performance under dynamic loads is critical.
• Chamfered top design - prevents mushrooming during installation, making the process cleaner and reducing the risk of installation errors.
• Suitable for horizontal, vertical, and overhead applications - provides installation flexibility across a wide range of structural anchoring scenarios.
• Standard ANSI fractional sizing with 3/8 in. drill bit and 9/16 in. wrench compatibility - installs using common tools and fits standard fixtures, reducing jobsite setup time and the need for specialty equipment.
• Tested per ACI355.2 and AC193 - meets recognized industry testing standards, supporting code compliance on commercial and structural projects.
• Full Type 316 stainless steel construction throughout all components - delivers superior corrosion resistance in demanding service environments, including those exposed to moisture, chemicals, or coastal conditions.

Why This Product

• Built for seismic and high-wind reliability - the wedge-type expansion design combined with secondary expansion capability through dual undercutting embossments makes this anchor an optimal choice where most standard wedge anchors fall short under dynamic or cracked-concrete conditions.
• All-stainless construction means no weak links - because the anchor body, nut, washer, and clip are all Type 316 stainless steel, corrosion resistance is consistent throughout the entire assembly, not just at the surface - critical for long-term performance in harsh or corrosive environments.
• Versatile code-listed approval supports a wide range of projects - with listings covering cracked and uncracked concrete, static and seismic loading, and horizontal, vertical, and overhead orientations, this anchor reduces the need for multiple anchor types on a single job.
• Installs with standard tools and common drill sizes - ANSI fractional sizing means no specialty tooling or adapters are required, keeping installation straightforward for contractors and structural trades working with standard equipment.

Specifications

• Model Number: STB2-37500S6F50
• Coating/Material: Type 316 Stainless Steel
• Size: 3/8 in. x 5 in.
• Drill Bit Diameter: 3/8 in.
• Thread Length: 3-9/16 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
• Packaging: Packs of 50 and Cartons of 200

Approved Applications

• Cracked concrete installations
• Uncracked concrete installations
• Seismic zone applications
• High-wind condition installations
• Corrosive and demanding service environments requiring stainless steel fasteners

Frequently Asked Questions

Is the Strong-Bolt 2 approved for use in cracked concrete?

Yes. The Strong-Bolt 2 is code listed for both cracked and uncracked concrete applications, making it suitable for a broad range of structural installations.

What makes the Strong-Bolt 2 suitable for seismic and high-wind conditions?

The wedge-type expansion design combined with dual undercutting embossments on each clip segment allows for secondary expansion if a crack forms at the anchor location, significantly increasing load-carrying capacity even when the hole expands - making it an optimal choice for seismic and high-wind environments.

Why is Type 316 stainless steel used for all components?

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, including those exposed to moisture, chemicals, or other corrosive conditions.

What drill bit diameter is required to install this anchor?

A 3/8" diameter drill bit is required to install the STB2-37500S6F50 wedge anchor.

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