Product Description
The Simpson Strong-Bolt 2 Wedge Anchor in 3/8 in. x 2 1/4 in. is a heavy-duty expansion anchor engineered for high-performance concrete fastening in demanding structural applications. Manufactured by Simpson from Type 304 stainless steel throughout, this wedge-type expansion anchor delivers long-lasting corrosion resistance across a wide variety of service environments - including humid, wet, and chemically active conditions where carbon steel anchors would degrade prematurely. Designed and tested for both cracked and uncracked concrete, it is a trusted solution for structural fastening in seismic zones, high-wind regions, and everyday concrete construction.
Key Features
- Type 304 stainless steel construction throughout the anchor body, nut, washer, and clip - provides durable corrosion resistance for use in harsh or corrosive service environments
- Code listed for cracked and uncracked concrete applications - gives engineers and contractors confidence in code compliance across a broad range of jobsite conditions
- Dual undercutting embossments on each clip segment enable secondary expansion if a crack forms and intersects the anchor location - significantly improves load-carrying ability when the hole expands due to cracking
- Chamfered top designed to prevent mushrooming during installation - protects the anchor threads and allows reliable nut engagement after driving
- Qualified for static and seismic loading conditions covering seismic design categories A through F - suitable for the full range of seismic risk zones required by building codes
- Suitable for horizontal, vertical, and overhead applications - offers installation flexibility for diverse structural and mechanical fastening scenarios
- Standard ANSI fractional sizing at 3/8 in. diameter - fits standard fixtures and installs with common drill bit and tool sizes already on the jobsite
- Tested per ACI 355.2 and AC193 - independent third-party testing standards provide verified load and performance data for engineering design
- Fully assembled out of the package - ready to install immediately, reducing setup time on the job
Why This Product
- Built for seismic and high-wind zones - the Strong-Bolt 2 is qualified for seismic design categories A through F, making it a reliable choice where code-compliant anchor performance under dynamic loading is required
- Secondary expansion technology adds a critical safety margin - if a crack intersects the anchor after installation, dual undercutting embossments on each clip allow the anchor to expand again and maintain load capacity, a meaningful advantage over standard wedge anchors in aging or stressed concrete
- Type 304 stainless steel resists corrosion in wet, humid, and chemically active environments - making this anchor well suited for outdoor structures, wastewater facilities, coastal construction, and other corrosive service conditions where long service life matters
- ANSI fractional 3/8 in. sizing installs with a standard 3/8 in. drill bit and 9/16 in. wrench - no specialty tooling required, keeping installation straightforward and efficient for professional and contractor use alike
Specifications
- Brand: Simpson Strong-Tie
- Diameter: 3/8 in.
- Length: 2 1/4 in.
- Thread Length: 1 in.
- Drill Bit Diameter: 3/8 in.
- Material: Type 304 Stainless Steel
- Finish: Type 304 Stainless Steel
Available Pack Options
- STB2-37214S4F50: 50 Pk
- STB2-37214S4F50 -5: 250 Pk
Install With
- Installs with 3/8 in. drill bit and 9/16 in. wrench size
Frequently Asked Questions
Is this anchor suitable for cracked concrete applications?
Yes. The Strong-Bolt 2 wedge anchor is code listed for both cracked and uncracked concrete applications. Its dual undercutting embossments on each clip segment allow secondary expansion if a crack forms and intersects the anchor location, helping to maintain load capacity in compromised concrete.
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, which represents the full spectrum of seismic risk classifications used in building codes across the United States.
What drill bit and wrench size are needed to install this anchor?
This anchor installs with a standard 3/8 in. drill bit and requires a 9/16 in. wrench. The ANSI fractional sizing is designed to work with common drill bits and tool sizes already found on most jobsites.
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 anchor well suited for applications where exposure to moisture, humidity, or chemicals would cause standard carbon steel anchors to corrode and lose structural integrity over time.
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