The Simpson Strong-Bolt 2 Wedge Anchor in 1/2 in. x 2-3/4 in., Type 304 Stainless Steel is a high-performance expansion anchor engineered by Simpson Strong-Tie for demanding concrete fastening applications, including seismic and high-wind environments. Built from Type 304 stainless steel, this wedge anchor delivers long-lasting corrosion resistance across a wide range of service conditions - making it a trusted choice for both interior structural work and corrosive or moisture-exposed environments. Whether you are anchoring into cracked or uncracked concrete, horizontally, vertically, or overhead, the Strong-Bolt 2 is tested and qualified to meet rigorous code requirements for reliable, code-compliant performance.

Key Features

• Dual undercutting embossments on each clip segment - enable secondary expansion if a crack forms and intersects the anchor location, significantly increasing the anchor's ability to carry load even when the hole expands
• Chamfered top design - prevents mushrooming during installation, making the driving process cleaner and reducing installation error
• Qualified for seismic design categories A through F - suitable for static and seismic loading conditions, giving engineers and installers confidence in high-seismic and high-wind applications
• Suitable for horizontal, vertical, and overhead applications - provides installation flexibility across a full range of orientations without compromising load capacity
• Standard ANSI fractional sizing at 1/2 in. diameter - fits standard fixtures and works with common drill bit and tool sizes, simplifying procurement and installation
• Tested per ACI355.2 and AC193 - meets industry-standard anchor testing protocols, supporting ICC-ES and code-listed approval for both cracked and uncracked concrete
• Type 304 stainless steel construction throughout - provides strong corrosion resistance for use in humid, coastal, chemical-exposed, or other demanding service environments where carbon steel would degrade
• 1/4 in. thread length of 1-1/4 in. - provides adequate thread engagement for secure, predictable clamping force on connected fixtures

Why This Product

• Built for cracked concrete - not just uncracked: The Strong-Bolt 2's dual undercutting embossment design means it continues to perform if a crack intersects the anchor location, making it the right choice for concrete structures subject to seismic activity or dynamic loading where crack formation is a real concern.
• Corrosion resistance where it matters: Type 304 stainless steel construction resists rust and degradation across a wide variety of service environments - including damp, humid, or chemically active conditions where standard zinc-plated anchors would fail prematurely.
• Seismic and wind code compliance built in: Qualified for seismic design categories A through F and tested per ACI355.2 and AC193, this anchor simplifies code compliance for structural engineers, contractors, and inspectors working on projects with demanding load requirements.
• Installs with standard tools: Standard ANSI fractional sizing means no specialty tooling is required - a common 1/2 in. drill bit and 3/4 in. wrench handle the entire installation, saving time and reducing setup cost on the job site.

Specifications

• Brand: Simpson Strong-Tie
• Finish: Type 304 Stainless Steel
• Material: Type 304 Stainless Steel
• Diameter: 1/2 in.
• Length: 2-3/4 in.
• Thread Length: 1-1/4 in.
• Drill Bit Diameter: 1/2 in.
• Country of Origin: China

Available Pack Options

• STB2-502344SS-R: 10 Pk
• STB2-502344SSR25: 25 Pk
• STB2-502344SSR25 -5: 125 Pk

Install With

• Installs with 1/2 in. drill bit and 3/4 in. wrench size

Frequently Asked Questions

Can the Strong-Bolt 2 be used 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 secondary expansion should a crack form and intersect the anchor location, enabling the anchor to continue carrying load even if the hole expands.

What seismic design categories is this anchor qualified for?

The Strong-Bolt 2 is qualified for static and seismic loading conditions covering seismic design categories A through F - the full range of seismic categories defined by building codes. It is also suitable for high-wind conditions.

What drill bit size is required for installation?

Installation requires a 1/2 in. diameter drill bit, which matches the anchor diameter. A 3/4 in. wrench is used to tighten the nut. Because the sizing follows standard ANSI fractional dimensions, no specialty tooling is needed.

Why is Type 304 stainless steel used for this anchor?

Type 304 stainless steel provides long-lasting corrosion resistance across a wide variety of service environments. This makes the Strong-Bolt 2 stainless-steel wedge anchor a suitable choice for applications where standard carbon steel or zinc-plated anchors may be susceptible to rust or degradation due to moisture, humidity, or chemical exposure.

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