The Simpson Strong-Bolt 2 5/8 in. x 4-1/2 in. Wedge Anchor is a wedge-type expansion anchor engineered by Simpson for reliable, high-performance anchoring in both cracked and uncracked concrete as well as masonry applications. 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. Qualified for static and seismic loading conditions covering seismic design categories A through F, this zinc-plated carbon steel anchor is built to perform in demanding structural, seismic, and high-wind environments across horizontal, vertical, and overhead installations.

Key Features

• Chamfered top design - prevents mushrooming during installation, keeping the anchor seating clean and reducing the risk of installation damage.
• Dual undercutting embossments on each clip segment - enable secondary expansion if a crack intersects the anchor location, maintaining load-carrying capacity in cracked concrete where other anchors may fail.
• Qualified for seismic design categories A through F - gives engineers and contractors confidence to specify this anchor in the highest seismic-risk zones without additional workarounds.
• Suitable for horizontal, vertical, and overhead applications - provides flexibility across a wide range of structural attachment scenarios on a single jobsite.
• Tested per ACI355.2 and AC193 - independently verified performance means the anchor meets the code requirements inspectors and project specifications demand.
• Zinc-plated carbon steel construction - provides corrosion resistance appropriate for standard interior and protected concrete anchoring applications.

Why This Product

• Built for seismic and high-wind reliability - the Strong-Bolt 2 is specifically engineered and code-listed for seismic design categories A through F and high-wind conditions, making it a straightforward choice for projects where structural performance under dynamic loading is non-negotiable.
• Secondary expansion protects load capacity in cracked concrete - the dual undercutting embossment design means the anchor continues to perform even if the base material cracks at the anchor point, reducing the risk of costly rework or anchor replacement.
• Versatile application range reduces the need for multiple anchor types - approval for cracked and uncracked concrete, masonry, and all installation orientations means one anchor SKU can cover a broad variety of attachment conditions on the same project.
• Straightforward installation with standard tooling - the anchor installs with a 5/8 in. drill bit and a 15/16 in. wrench, tools commonly found on any concrete anchoring jobsite, minimizing setup time and specialized equipment costs.

Specifications

• Size: 5/8 in. x 4-1/2 in.
• MPN: STB2-62412F20
• Brand: Simpson Strong-Tie
• Diameter: 5/8 in.
• Length: 4-1/2 in.
• Thread Length: 2-7/16 in.
• Material: Carbon Steel
• Coating/Finish: Zinc Plated
• Installation: Installs with 5/8 in. drill bit and 15/16 in. wrench size
• Packaging: Packs of 20 and Cartons of 80
• Drill Bit Diameter: 5/8 in.

Approved Applications

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

Frequently Asked Questions

What drill bit and wrench size are required to install the Strong-Bolt 2 wedge anchor?

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

Is the Strong-Bolt 2 suitable for use in seismic zones?

Yes. The Strong-Bolt 2 is qualified for static and seismic loading conditions, covering seismic design categories A through F, making it appropriate for high-seismic and high-wind applications.

What makes the Strong-Bolt 2 perform well in cracked concrete?

Dual undercutting embossments on each clip segment enable secondary expansion should a crack form and intersect the anchor location. This feature significantly increases the ability of the Strong-Bolt 2 to carry load if the hole expands, making it code listed for both cracked and uncracked concrete.

What other material options are available for the Strong-Bolt 2?

In addition to zinc-plated carbon steel, the Strong-Bolt 2 is available in mechanically galvanized carbon steel, Type 304 stainless steel, and Type 316 stainless steel to suit a variety of environmental and corrosion-resistance requirements.

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