The Simpson Strong-Bolt 2 1/4 in. x 1 3/4 in. Wedge Anchor in Type 316 Stainless Steel is a wedge-type expansion anchor built for high-performance concrete fastening in the most 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. With all components constructed from Type 316 Stainless Steel, this anchor delivers long-lasting corrosion resistance across a wide variety of service environments.

Key Features

• Chamfered top design - prevents mushrooming during installation, keeping the anchor seated properly and reducing installation errors on the job.
• Qualified for static and seismic loading conditions (seismic design categories A through F) - meets code requirements for the full range of seismic zones, giving engineers and contractors confidence in structural applications.
• Dual undercutting embossments on each clip segment - provide secondary expansion if a crack intersects the anchor location, maintaining load-carrying capacity even as concrete conditions change.
• Suitable for horizontal, vertical, and overhead applications - offers installation flexibility across a wide range of concrete fastening scenarios without requiring a different anchor for each orientation.
• Standard ANSI fractional sizing - fits standard fixtures and installs with common drill bit and tool sizes, reducing the need for specialized equipment on site.
• Tested per ACI355.2 and AC193 - independently verified performance gives specifiers and inspectors the documentation needed for code-compliant projects.
• Made from Type 316 Stainless Steel throughout - anchor body, nut, washer, and clip all share the same material, eliminating galvanic incompatibility and ensuring uniform corrosion resistance in harsh or moisture-exposed environments.
• Installs with a 1/4 in. drill bit and 7/16 in. wrench - straightforward tooling requirements keep installation fast and accessible for any crew.

Why This Product

• Built to perform where ordinary anchors fall short - qualification for seismic design categories A through F and testing per ACI355.2 and AC193 make this wedge anchor a reliable, code-supported choice for structural concrete fastening in high-wind and seismic zones.
• Secondary expansion protects your connection if concrete cracks - the dual undercutting embossments on each clip segment are engineered to engage again if a crack forms at the anchor location, a meaningful safety advantage in applications where long-term load integrity matters.
• All-316 Stainless Steel construction resists corrosion at every point of contact - because every component shares the same Type 316 material, there is no weak link in environments exposed to moisture, chemicals, or other corrosive conditions.
• Versatile installation across orientations and standard tooling - approved for horizontal, vertical, and overhead use with a standard 1/4 in. drill bit and 7/16 in. wrench, this anchor adapts to varied project conditions without adding complexity or cost to the installation process.

Specifications

• Model Number: STB2-25134S6F100
• Coating/Material: Type 316 Stainless Steel
• Size: 1/4 in. x 1-3/4 in.
• Drill Bit Diameter: 1/4 in.
• Thread Length: 1-5/16 in.
• Component Material - Anchor Body: Type 316 Stainless Steel
• Component Material - Nut: Type 316 Stainless Steel
• Component Material - Washer: Type 316 Stainless Steel
• Component Material - Clip: Type 316 Stainless Steel
• Packaging: Packs of 100 and Cartons of 500

Approved Applications

• Cracked concrete fastening applications
• Uncracked concrete fastening applications
• Seismic zone installations requiring code-listed anchors
• High-wind condition structural fastening
• Service environments requiring long-lasting corrosion resistance

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 allow for secondary expansion if a crack forms and intersects the anchor location, significantly increasing the anchor's ability to carry load even if the hole expands.

Why is Type 316 Stainless Steel used for this anchor?

Type 316 Stainless Steel provides long-lasting corrosion resistance suitable for a wide variety of service environments, including those with exposure to moisture, chemicals, or other corrosive conditions that would degrade standard carbon steel anchors over time.

What drill bit diameter is required for installation?

A 1/4" diameter drill bit is required for proper installation of the STB2-25134S6F100 wedge anchor, matching the anchor's nominal diameter for a consistent, code-compliant fit in the concrete substrate.

Can this anchor be used in seismic or high-wind applications?

Yes. The Strong-Bolt 2 is specifically noted as an optimal choice for high-performance fastening in seismic and high-wind conditions, and it is code listed to support these demanding structural requirements.

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