Simpson Strong-Bolt 2 Wedge Anchor - 1/2 in. x 7 in. - Type 304 Stainless Steel is a high-performance wedge-type expansion anchor engineered for demanding structural applications in cracked and uncracked concrete. Built by Simpson, this stainless-steel anchor delivers dependable holding strength in seismic zones, high-wind regions, and corrosive environments where long-term reliability is critical. The Type 304 stainless steel construction resists rust and deterioration across a wide range of service conditions, making it a sound choice for both interior and exterior concrete fastening projects.

Key Features

• Type 304 stainless steel construction - provides long-lasting corrosion resistance in wet, outdoor, and chemically demanding environments
• Code listed for cracked and uncracked concrete applications - gives engineers and inspectors confidence that the anchor meets recognized performance standards for structural use
• Dual undercutting embossments on each clip segment enable secondary expansion - if a crack forms and intersects the anchor location, the design significantly increases the anchor's ability to continue carrying load even as the hole expands
• Qualified for static and seismic loading conditions (seismic design categories A through F) - suitable for use in the most demanding seismic zones without requiring a special product substitution
• Chamfered top designed to prevent mushrooming during installation - allows for cleaner, faster driving and reduces the risk of installation damage
• Suitable for horizontal, vertical, and overhead applications - gives installers flexibility to use a single anchor type across multiple orientations on the same job
• 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 - backed by independent testing protocols so performance values can be used in engineered designs with confidence
• Installs with a 1/2 in. drill bit and 3/4 in. wrench - common tooling means no specialty equipment is needed on the job site

Why This Product

• Engineered for seismic and high-wind conditions - the Strong-Bolt 2's secondary expansion capability addresses one of the most critical failure scenarios in cracked concrete, making it a reliable choice where building codes demand seismic performance categories A through F.
• Type 304 stainless steel throughout - for applications where moisture, salt air, or chemicals could degrade a carbon steel anchor over time, the all-stainless construction protects the investment and maintains structural integrity for the life of the installation.
• Versatile orientation use - because the anchor performs in horizontal, vertical, and overhead positions, one product covers a broad range of structural concrete fastening tasks without needing multiple anchor types on a project.
• Meets recognized code and testing standards - ACI355.2 and AC193 testing, combined with code listing for both cracked and uncracked concrete, means this anchor can be specified with confidence by engineers and approved by inspectors across a wide range of jurisdictions.

Specifications

• Brand: Simpson Strong-Tie
• Diameter: 1/2 in.
• Length: 7 in.
• Thread Length: 5 5/16 in.
• Drill Bit Diameter: 1/2 in.
• Material: Type 304 Stainless Steel
• Finish: Type 304 Stainless Steel

Available Pack Options

• STB2-507004SS-R: 4 Pk
• STB2-507004SS: 25 Pk
• STB2-507004SS -4P: 100 Pk

Install With

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

Frequently Asked Questions

Can this anchor 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 for secondary expansion if a crack forms and intersects the anchor location, enabling the anchor to continue carrying load even as the hole expands.

Is this anchor approved for seismic applications?

Yes. The Strong-Bolt 2 is qualified for both static and seismic loading conditions, covering seismic design categories A through F. It has been tested per ACI355.2 and AC193, allowing it to be used in engineered designs in high-seismic regions.

What tools are needed to install this anchor?

Installation requires a 1/2 in. drill bit to prepare the hole and a 3/4 in. wrench to tighten the anchor. These are standard tool sizes, so no specialty equipment is needed.

Why choose Type 304 stainless steel over a standard carbon steel anchor?

Type 304 stainless steel offers long-lasting corrosion resistance across a wide variety of service environments. This makes it particularly well suited for outdoor, wet, or chemically exposed concrete fastening applications where a standard carbon steel anchor could corrode and lose structural integrity over time.