The Simpson Strong-Bolt 2 Wedge Anchor in 3/4 in. x 6-1/4 in. by Simpson is a high-performance wedge-type expansion anchor engineered for demanding concrete fastening applications - including those subject to seismic and high-wind conditions. Constructed entirely from Type 304 stainless steel, this anchor delivers long-lasting corrosion resistance across a wide variety of service environments where ordinary carbon steel anchors would degrade prematurely. Whether you are securing structural connections in cracked or uncracked concrete, or working in orientations ranging from vertical to overhead, the Strong-Bolt 2 is a code-listed solution built for reliability where it matters most.

Key Features

• Dual undercutting embossments on each clip segment enable secondary expansion if a crack forms and intersects the anchor - this significantly increases the anchor's ability to carry load even when the hole expands, providing a critical safety margin in dynamic conditions
• Code listed for cracked and uncracked concrete applications - gives engineers and inspectors the documentation they need for permitted work without additional testing or approvals
• Qualified for static and seismic loading conditions (seismic design categories A through F) - suitable for use in the most demanding seismic zones across the United States
• Chamfered top designed to prevent mushrooming during installation - maintains thread integrity so the nut seats cleanly and installation torque is applied correctly
• Suitable for horizontal, vertical, and overhead applications - versatile orientation capability reduces the need to stock multiple anchor types for different installation scenarios
• Standard (ANSI) fractional sizes - fits standard fixtures and installs with common drill bit and tool sizes, reducing jobsite complexity and equipment requirements
• Tested per ACI 355.2 and AC193 - meets recognized industry test standards, supporting use on code-compliant commercial and residential projects
• Made from Type 304 stainless steel - provides long-lasting corrosion resistance in wet, coastal, chemical-exposed, and other harsh service environments where carbon steel anchors are not appropriate

Why This Product

• Built for seismic zones A through F - if your project is in a high-seismic or high-wind region, this anchor is specifically qualified for those loading conditions, removing guesswork from the anchor selection process
• Secondary expansion capability means the anchor does not simply fail when concrete cracks - the dual undercutting clip design maintains load-carrying capacity even after cracking, making it a safer long-term choice for structural applications
• Type 304 stainless steel construction makes this anchor appropriate for environments where corrosion is a concern - such as exterior concrete, wastewater facilities, pool decks, and coastal structures - where a standard zinc-plated anchor would have a significantly shorter service life
• Installs with a standard 3/4 in. drill bit and a 1-1/8 in. wrench - no specialty tooling required, so crews already equipped with common hardware can install this anchor without additional investment in tools or accessories

Specifications

• Brand: Simpson Strong-Tie
• Diameter: 3/4 in.
• Length: 6-1/4 in.
• Thread Length: 3-15/16 in.
• Drill Bit Diameter: 3/4 in.
• Material: Type 304 Stainless Steel
• Finish: Type 304 Stainless Steel
• Test Standards: ACI 355.2 and AC193
• Seismic Design Categories: A through F

Available Pack Options

• STB2-756144SS: 10 Pk
• STB2-756144SS -4P: 40 Pk

Install With

• Installs with 3/4 in. drill bit and 1-1/8 in. wrench size

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, helping maintain load-carrying capacity even after cracking occurs.

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 recognized under U.S. building codes - making it appropriate for projects in the most seismically active regions.

Can this anchor be installed in orientations other than vertical?

Yes. The Strong-Bolt 2 is suitable for horizontal, vertical, and overhead concrete fastening applications, providing flexibility across a wide range of structural and architectural installation scenarios.

Why choose Type 304 stainless steel over a standard plated anchor for this application?

Type 304 stainless steel offers long-lasting corrosion resistance for a wide variety of service environments - including exterior concrete, coastal locations, and areas exposed to moisture or chemicals - where standard carbon steel or zinc-plated anchors would corrode and lose structural integrity over time.