Product Description
The Simpson Strong-Bolt 2 Wedge Anchor in 5/8 in. x 3-1/2 in., Type 316 Stainless Steel is a wedge-type expansion anchor engineered by Simpson for high-performance structural connections in demanding conditions, including seismic and high-wind environments. Its dual undercutting embossments on each clip segment enable secondary expansion should a crack form and intersect the anchor location, significantly increasing load-carrying capacity even if the hole expands. Built entirely from Type 316 stainless steel, this anchor delivers long-lasting corrosion resistance across a wide variety of service environments where standard carbon steel anchors would be insufficient.
Key Features
- Dual undercutting embossments on each clip segment - enable secondary expansion if a crack forms at the anchor location, helping maintain load capacity in cracked concrete conditions common during seismic events
- Chamfered top design - prevents mushrooming during installation, reducing installation errors and keeping the anchor flush for a clean, secure fit
- Qualified for static and seismic loading conditions (seismic design categories A through F) - provides confidence for engineers and contractors specifying anchors in the most demanding code-required structural applications
- Suitable for horizontal, vertical, and overhead applications - offers installation flexibility so a single anchor can be used across multiple orientations on the same project
- Tested per ACI355.2 and AC193 - meets recognized industry testing standards, supporting use in permitted and inspected structural work
- Standard ANSI fractional sizing at 5/8 in. diameter - fits standard fixtures and installs with common drill bit and tool sizes, minimizing the need for specialty equipment on the job site
- Made from Type 316 stainless steel throughout - resists corrosion in a wide variety of service environments, including coastal, chemical, and other aggressive exposure conditions where carbon steel anchors would degrade prematurely
- Installs with a 5/8 in. drill bit and 15/16 in. wrench - straightforward tool requirements keep installation simple and efficient for crews using standard equipment
Why This Product
- Built for seismic and high-wind structural demands - the Strong-Bolt 2 is specifically qualified for seismic design categories A through F, and its secondary expansion capability under cracked concrete conditions makes it a dependable choice where other wedge anchors may lose holding strength during a seismic event
- All-316 stainless steel construction throughout every component - with the anchor body, nut, washer, and clip all made from Type 316 stainless steel, corrosion resistance is not limited to the outer surface, making this anchor a sound long-term investment in harsh or corrosive service environments
- Versatile enough for nearly any concrete anchoring application - approval for cracked and uncracked concrete, combined with suitability for horizontal, vertical, and overhead installations, means this single anchor covers a broad range of structural connection scenarios without requiring substitutions
- Backed by rigorous independent testing - testing per ACI355.2 and AC193 means published load values are independently verified, giving engineers the data confidence needed for code-compliant structural design
Specifications
- Size: 5/8 in. x 3-1/2 in.
- Manufacturer Part Number (MPN): STB2-623126SSR20
- Brand: Simpson Strong-Tie
- Material: Type 316 Stainless Steel
- Finish: Type 316 Stainless Steel
- Diameter: 5/8 in.
- Length: 3-1/2 in.
- Thread Length: 1-5/8 in.
- Anchor Body Material: Type 316 Stainless Steel
- Nut Material: Type 316 Stainless Steel
- Washer Material: Type 316 Stainless Steel
- Clip Material: Type 316 Stainless Steel
- Required Drill Bit Size: 5/8 in.
- Required Wrench Size: 15/16 in.
- Packaging: Packs of 20 and Cartons of 100
Approved Applications
- Seismic design categories A through F
- High-wind structural connections
- Cracked and uncracked concrete installations
- Horizontal anchor installations
- Vertical anchor installations
- Overhead anchor installations
Note: Product dimensions and/or thread length may differ from picture. Please see the item description above for specifications.
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 across 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, which significantly increases the ability of the anchor to carry load even if the hole expands during a seismic event.
What size drill bit and wrench are needed to install this anchor?
The Strong-Bolt 2 STB2-623126SSR20 installs with a 5/8 in. drill bit and requires a 15/16 in. wrench size for installation.
Why is Type 316 stainless steel used for this wedge anchor?
Type 316 stainless steel provides long-lasting corrosion resistance for a wide variety of service environments. All components - including the anchor body, nut, washer, and clip - are made from Type 316 stainless steel, making this anchor well suited for applications where exposure to moisture, chemicals, or other corrosive elements is a concern.
What testing standards has the Strong-Bolt 2 been evaluated against?
The Strong-Bolt 2 has been tested per ACI355.2 and AC193, and is code listed for both cracked and uncracked concrete applications, ensuring it meets rigorous performance standards for structural anchor installations.
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