Product Description
The Simpson Strong-Bolt 2 5/8 in. x 3 1/2 in. Type 304 Stainless Steel Wedge Anchor is a high-performance wedge-type expansion anchor engineered for reliable concrete fastening under static, seismic, and high-wind conditions. Built entirely from Type 304 stainless steel, this anchor delivers long-lasting corrosion resistance across a wide variety of service environments, making it a dependable choice for structural and architectural anchoring where both strength and durability are critical. Dual undercutting embossments on each clip segment enable secondary expansion should a crack form and intersect the anchor location, significantly increasing the ability of the Strong-Bolt 2 to carry load if the hole expands - a key advantage in demanding cracked and uncracked concrete applications.
Key Features
- Chamfered top designed to prevent mushrooming during installation - protects the anchor during driving, preserving thread integrity and reducing the risk of installation damage.
- Qualified for static and seismic loading conditions (seismic design categories A through F) - gives contractors and engineers the confidence to specify this anchor across virtually all U.S. seismic zones.
- Dual undercutting embossments on each clip segment enable secondary expansion - maintains load-carrying capacity even if a crack intersects the anchor location, a critical safety advantage in concrete that may shift over time.
- Suitable for horizontal, vertical, and overhead applications - offers installation flexibility for a wide range of structural, mechanical, and architectural fastening tasks.
- Standard (ANSI) fractional sizes - fits standard fixtures and installs with common drill bit and tool sizes, simplifying jobsite logistics and reducing the need for specialized equipment.
- Tested per ACI355.2 and AC193 - independently verified performance gives engineers and inspectors the documentation needed for code-compliant installations.
- Made from Type 304 stainless steel throughout - provides long-lasting corrosion resistance in moisture-exposed, coastal, or chemically challenging service environments where carbon steel fasteners would degrade.
Why This Product
- Built for seismic and high-wind reliability - the Strong-Bolt 2's dual undercutting clip embossments provide secondary expansion if a crack develops at the anchor point, preserving structural integrity in the conditions where anchor performance matters most.
- Full stainless steel construction for corrosion-prone environments - with the anchor body, nut, and washer all made from Type 304 stainless steel, this wedge anchor is a purpose-built solution for exterior, coastal, and moisture-exposed concrete anchoring applications.
- Verified performance backed by recognized testing standards - qualification to ACI355.2 and AC193, covering seismic design categories A through F, provides the engineering documentation and code compliance assurance that architects, engineers, and inspectors require on commercial and structural projects.
- Installs with standard tools and no special drill size - the 5/8 in. drill bit requirement and 15/16 in. wrench size align with common jobsite equipment, so crews can complete installations efficiently without sourcing specialty tooling.
Specifications
- Size: 5/8 in. x 3-1/2 in.
- MPN: STB2-623124SSR20
- Brand: Simpson Strong-Tie
- Material: Type 304 Stainless Steel
- Finish: Type 304 Stainless Steel
- Diameter: 5/8 in.
- Length: 3-1/2 in.
- Thread Length: 1-5/8 in.
- Anchor Body Material: Type 304 Stainless Steel
- Nut Material: Type 304 Stainless Steel
- Washer Material: Type 304 Stainless Steel
- Clip Material: Type 304 or Type 316 Stainless Steel
- Install With: 5/8 in. drill bit and 15/16 in. wrench size
- Testing Standards: ACI355.2 and AC193
- Packaging: Packs of 20 and Cartons of 100
- Drill Bit Diameter: 5/8 in.
Approved Applications
- Cracked and uncracked concrete anchoring applications
- Seismic design categories A through F
- High-wind structural anchoring conditions
- Horizontal, vertical, and overhead installations
- Corrosion-prone or moisture-exposed service environments requiring stainless steel fasteners
Note: Product dimensions and/or thread length may differ from picture. Please refer to the specifications listed above for accurate product details.
Frequently Asked Questions
What makes the Strong-Bolt 2 suitable for seismic applications?
The Strong-Bolt 2 is qualified for static and seismic loading conditions covering seismic design categories A through F. Its dual undercutting embossments on each clip segment enable secondary expansion should a crack form and intersect the anchor location, significantly increasing the ability of Strong-Bolt 2 to carry load if the hole expands - a critical performance advantage in seismic and high-wind environments.
What tools are needed to install this wedge anchor?
This anchor installs with a 5/8 in. drill bit and requires a 15/16 in. wrench size for tightening. Its standard (ANSI) fractional sizing ensures compatibility with common drill bits and tool sizes used for standard fixtures.
Why is the top of the Strong-Bolt 2 chamfered?
The chamfered top is specifically designed to prevent mushrooming during installation. This feature helps maintain the integrity of the anchor head and ensures a cleaner, more controlled installation process.
Is this anchor appropriate for use in corrosive environments?
Yes. The Strong-Bolt 2 stainless-steel wedge anchor is made from Type 304 stainless steel throughout - including the anchor body, nut, and washer - offering long-lasting corrosion resistance for a wide variety of service environments where moisture or chemical exposure may be a concern.
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