The Simpson Strong-Bolt 2 Wedge Anchor in 5/8 in. x 3 1/2 in. is a wedge-type expansion anchor engineered by Simpson for high-performance structural fastening in demanding conditions, including seismic and high-wind environments. 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. Built from zinc-plated carbon steel and tested per ACI355.2 and AC193, this anchor delivers dependable holding power across cracked and uncracked concrete applications in a wide range of installation orientations.

Key Features

• Chamfered top - prevents mushrooming during installation, making the driving process cleaner and reducing the risk of installation damage.
• Dual undercutting embossments on each clip segment - provide secondary expansion if a crack intersects the anchor location, helping the anchor maintain load-carrying capacity even as the hole expands.
• Qualified for seismic design categories A through F - confirms the anchor meets the performance requirements for both static and seismic loading conditions, giving structural professionals confidence in code-sensitive projects.
• Suitable for horizontal, vertical, and overhead applications - adds installation flexibility so a single anchor solution works across multiple jobsite orientations without additional products.
• Tested per ACI355.2 and AC193 - provides independently verified performance data that engineers and inspectors can reference to satisfy approval and compliance requirements.
• Zinc-plated carbon steel construction - delivers a corrosion-resistant finish appropriate for a broad range of interior and protected concrete anchoring applications.

Why This Product

• Built for seismic and high-wind conditions - the Strong-Bolt 2 is specifically qualified for seismic design categories A through F, making it a trustworthy choice for concrete anchor applications where code compliance and structural resilience are non-negotiable.
• Self-reinforcing under stress - the dual undercutting embossment design actively responds to cracking at the anchor location by enabling secondary expansion, so the connection continues to perform even if the base material is compromised.
• Versatile installation compatibility - approved for horizontal, vertical, and overhead use in both cracked and uncracked concrete, this wedge anchor reduces the need to source separate fasteners for different orientations or substrate conditions on the same project.
• Backed by industry-standard testing - compliance with ACI355.2 and AC193 means the performance data is documented and verifiable, streamlining the submittal and inspection process for contractors and engineers alike.

Specifications

• Size: 5/8 in. x 3-1/2 in.
• MPN: STB2-62312R20
• Brand: Simpson Strong-Tie
• Diameter: 5/8 in.
• Length: 3-1/2 in.
• Thread Length: 1-5/8 in.
• Material: Carbon Steel
• Coating/Finish: Zinc Plated
• Drill Bit Size: 5/8 in.
• Wrench Size: 15/16 in.
• Packaging: Packs of 20 and Cartons of 100

Approved Applications

• Cracked and uncracked concrete applications
• Masonry applications
• Seismic design categories A through F
• High-wind structural conditions
• Horizontal, vertical, and overhead installations
• Static and seismic loading conditions

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 if a crack forms and intersects the anchor location, significantly increasing the anchor's ability to carry load even as the hole expands.

What size drill bit and wrench are required for installation?

The Strong-Bolt 2 in this size installs with a 5/8 in. drill bit and requires a 15/16 in. wrench for tightening.

Can this anchor be used in overhead or horizontal installations?

Yes. The Strong-Bolt 2 is suitable for horizontal, vertical, and overhead applications, making it a versatile choice for a wide range of structural fastening tasks.

What standards has the Strong-Bolt 2 been tested to?

The Strong-Bolt 2 has been tested per ACI355.2 and AC193, confirming its performance in both cracked and uncracked concrete as well as masonry applications.

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