The Simpson Strong-Bolt 2 Wedge Anchor in 1/4 in. x 1 3/4 in., Type 304 Stainless Steel is a wedge-type expansion anchor engineered for high-performance concrete fastening in the most demanding conditions. Built entirely from Type 304 Stainless Steel, this anchor is an optimal choice for projects where long-lasting corrosion resistance is required - whether in moisture-exposed, chemical-prone, or outdoor service environments. Its dual undercutting embossments on each clip segment enable secondary expansion should a crack form and intersect the anchor location, significantly increasing load-carrying capacity even when the base material is compromised. Qualified for static and seismic loading across seismic design categories A through F, this anchor delivers the reliability required for structural applications in both cracked and uncracked concrete.

Key Features

• Chamfered top design - prevents mushrooming during installation, making the anchor easier to seat cleanly and reducing the risk of installation errors.
• Dual undercutting embossments on each clip segment - enable secondary expansion if a crack intersects the anchor location, significantly increasing the ability to carry load when the concrete hole expands.
• Qualified for static and seismic loading conditions (seismic design categories A through F) - gives engineers and installers the code-listed confidence needed for structural and seismic applications.
• Suitable for horizontal, vertical, and overhead applications - provides installation flexibility across a wide range of jobsite orientations without requiring a different anchor type.
• Type 304 Stainless Steel construction throughout - delivers long-lasting corrosion resistance for use in corrosive, moisture-exposed, or chemically active service environments.
• Standard ANSI fractional sizing (1/4 in. diameter) - fits standard fixtures and installs with a common 1/4 in. drill bit and 7/16 in. wrench, minimizing the need for specialty tooling.
• Tested per ACI355.2 and AC193 - independently verified performance standards give buyers assurance the anchor meets recognized industry testing requirements.

Why This Product

• Engineered for cracked concrete environments - the dual undercutting embossments on each clip segment enable secondary expansion when cracks intersect the anchor, making this wedge anchor a dependable choice where base material integrity cannot be guaranteed.
• Seismic and high-wind rated for structural-grade reliability - qualification across seismic design categories A through F means this concrete anchor meets the performance thresholds required for safety-critical structural connections in high-demand regions.
• All-stainless construction resists corrosion over the long term - with the anchor body, nut, and washer all made from Type 304 Stainless Steel, this fastener is well-suited for corrosive, outdoor, and moisture-exposed applications where standard carbon steel anchors would degrade.
• Installs with standard tools, no specialty equipment required - compatible with a common 1/4 in. drill bit and a 7/16 in. wrench, this anchor simplifies procurement and speeds up installation across a wide variety of concrete fastening projects.

Specifications

• Model Number: STB2-25134S4F100
• Coating/Material: Type 304 Stainless Steel
• Size: 1/4 in. x 1-3/4 in.
• Drill Bit Diameter: 1/4 in.
• Thread Length: 1-5/16 in.
• 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
• Anchor Type: Wedge-Type Expansion Anchor
• Brand: Simpson Strong-Tie
• Packaging: Packs of 100 and Cartons of 500

Approved Applications

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

Frequently Asked Questions

What makes the Strong-Bolt 2 suitable for cracked concrete?

The Strong-Bolt 2 features dual undercutting embossments on each clip segment that enable secondary expansion should a crack form and intersect the anchor location. This design significantly increases the anchor's ability to carry load even when the hole expands due to cracking.

Is this anchor appropriate for outdoor or corrosive environments?

Yes. The anchor body, nut, and washer are all manufactured from Type 304 Stainless Steel, which offers long-lasting corrosion resistance for a wide variety of service environments where moisture or chemical exposure may be a concern.

What drill bit size is required to install the STB2-25134S4F100?

A 1/4-inch diameter drill bit is required for installation of this wedge anchor.

Is this anchor code listed for seismic applications?

Yes. The Strong-Bolt 2 is code listed for both cracked and uncracked concrete applications and is an optimal choice for high-performance use in seismic and high-wind conditions.

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