The Simpson Strong-Bolt 2 Wedge Anchor is a 5/8 in. x 10 in. wedge-type expansion anchor engineered from Type 304 stainless steel, delivering long-lasting corrosion resistance across a wide variety of service environments. Built for high-performance structural anchoring, this concrete wedge anchor is an optimal choice even in seismic and high-wind conditions. Dual undercutting embossments on each clip segment enable secondary expansion should a crack form and intersect the anchor location, significantly increasing the anchor's ability to carry load if the hole expands - a critical advantage in demanding or unpredictable jobsite conditions.

Key Features

• Code listed for cracked and uncracked concrete applications - gives installers confidence the anchor meets code requirements across a broad range of structural concrete conditions, reducing the need for project-specific engineering approval.
• Dual undercutting embossments on each clip segment enable secondary expansion - if a crack forms and intersects the anchor location, the anchor continues to carry load rather than losing holding strength, adding a critical layer of structural reliability.
• Qualified for static and seismic loading conditions (seismic design categories A through F) - suitable for the full spectrum of seismic risk zones, making this anchor appropriate for projects in earthquake-prone and high-wind regions.
• Chamfered top designed to prevent mushrooming during installation - protects the anchor threads and top surface during driving, resulting in cleaner, more consistent installations and reducing the risk of installation damage.
• Suitable for horizontal, vertical, and overhead applications - provides installation flexibility across multiple orientations, so one anchor model handles a wider range of structural fastening tasks on the same jobsite.
• Standard (ANSI) fractional sizes installs with a 5/8 in. drill bit and 15/16 in. wrench - compatible with common drill bits and tools already on hand, minimizing the need for specialty equipment and keeping installation straightforward.
• Tested per ACI355.2 and AC193 - third-party testing to recognized industry standards provides verifiable performance data, supporting code compliance documentation on commercial and structural projects.
• Made from Type 304 stainless steel throughout - the anchor body, nut, and washer all share the same corrosion-resistant material, making this expansion anchor well suited for exterior, coastal, or moisture-exposed concrete anchoring applications.

Why This Product

• Engineered for the most demanding load conditions - the Strong-Bolt 2 is specifically qualified for seismic design categories A through F and high-wind environments, making it a dependable choice for structural concrete anchoring where performance requirements are non-negotiable.
• Built-in redundancy if concrete cracks - the dual undercutting embossments on each clip segment provide secondary expansion should a crack intersect the anchor, a design feature that actively works to maintain load capacity rather than simply accepting reduced performance.
• Full Type 304 stainless steel construction resists corrosion long term - with the anchor body, hardware, and clip all made from stainless steel, this wedge anchor is suited for service environments where standard carbon steel anchors would deteriorate over time.
• Versatile installation across orientations and concrete conditions - approved for cracked and uncracked concrete in horizontal, vertical, and overhead positions, this concrete expansion anchor covers a wide range of structural fastening scenarios with a single, code-listed solution.

Specifications

• Model Number: STB2-62100S4F10
• Size: 5/8 in. x 10 in.
• Diameter: 5/8 in.
• Length: 10 in.
• Thread Length: 6 in.
• Material: Type 304 Stainless Steel
• Finish: Type 304 Stainless Steel
• 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
• Required Drill Bit: 5/8 in.
• Required Wrench Size: 15/16 in.
• Packaging: Packs of 10 and Cartons of 20

Approved Applications

• Cracked concrete applications
• Uncracked concrete applications
• Seismic loading conditions - seismic design categories A through F
• Static loading conditions
• High-wind conditions
• Horizontal installations
• Vertical installations
• Overhead installations

Frequently Asked Questions

What type of concrete can the Strong-Bolt 2 be used in?

The Strong-Bolt 2 is code listed for both cracked and uncracked concrete applications, making it suitable for a broad range of structural concrete conditions.

Is this anchor rated for seismic applications?

Yes. The Strong-Bolt 2 is qualified for static and seismic loading conditions across seismic design categories A through F, making it an optimal choice for high-performance installations in seismic and high-wind environments.

What tools are needed to install the STB2-62100S4F10?

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 tools.

Why is the top of the Strong-Bolt 2 chamfered?

The chamfered top is specifically designed to prevent mushrooming during installation, helping to ensure a clean, reliable installation process and reducing the risk of damage to the anchor head.

Note: Product dimensions and/or thread length may differ from picture. Please see the item description above for specifications.