The Simpson Strong-Bolt 2 Wedge Anchor, 3/4 in. x 5-1/2 in. is a wedge-type expansion anchor from Simpson engineered for high-performance structural connections in demanding environments. Built from zinc-plated carbon steel and qualified for seismic design categories A through F, this expansion anchor is a dependable solution for concrete and masonry fastening where static loads, seismic forces, and high-wind conditions are all part of the equation. 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 critical advantage in real-world field conditions.

Key Features

• Code listed for cracked and uncracked concrete, and masonry applications - gives installers and engineers confidence that this anchor meets recognized standards across a wide range of substrate conditions.
• Dual undercutting embossments on each clip segment enable secondary expansion - if a crack forms and intersects the anchor location, the anchor re-engages to maintain load capacity, reducing the risk of failure in compromised concrete.
• Qualified for static and seismic loading conditions (seismic design categories A through F) - suitable for projects in virtually any seismic zone, making it a go-to wedge anchor for code-compliant structural work.
• Chamfered top designed to prevent mushrooming during installation - promotes cleaner, faster driving and helps protect threads so the nut seats properly without rework.
• Suitable for horizontal, vertical, and overhead applications - versatile orientation capability means a single anchor solution works across multiple installation scenarios on the same job site.
• Tested per ACI355.2 and AC193 - independent third-party testing standards validate performance claims, supporting use on engineered and inspected projects.
• Installs with a 3/4 in. drill bit - the drill bit diameter matches the anchor diameter exactly, simplifying hole prep and reducing the chance of sizing errors in the field.

Why This Product

• Built for the most demanding structural environments - with qualification for seismic design categories A through F and tested performance in high-wind conditions, this wedge anchor covers applications where standard anchors may fall short.
• Secondary expansion technology adds a critical safety margin - the dual undercutting embossments allow the anchor to adapt if concrete cracks at the installation point, maintaining load-carrying ability rather than simply failing - a design feature that directly supports structural integrity over the life of the connection.
• Broad substrate and orientation approvals simplify specification - code listing for cracked concrete, uncracked concrete, and masonry, combined with approval for vertical, horizontal, and overhead use, means this single anchor model can satisfy multiple fastening needs across a project without substitutions.
• Backed by Simpson engineering and recognized testing standards - compliance with ACI355.2 and AC193 means the performance data behind this anchor is independently verified, giving engineers and contractors a reliable basis for load calculations and code submittals.

Specifications

• Model No.: STB2-75512F10
• Coating/Material: Zinc Plated / Carbon Steel
• Size (in.): 3/4 in. x 5-1/2 in.
• Drill Bit Diameter (in.): 3/4 in.
• Thread Length (in.): 3-3/16 in.
• Component Material, Anchor Body: Carbon Steel
• Component Material, Nut: Carbon Steel ASTM A 563, Grade A
• Component Material, Washer: Carbon Steel ASTM F844
• Component Material, Clip: Carbon Steel ASTM A 568
• Packaging: Packs of 10 and Cartons of 40

Approved Applications

• Cracked concrete installations
• Uncracked concrete installations
• Masonry applications
• Seismic applications
• High-wind condition installations

Frequently Asked Questions

Is the Strong-Bolt 2 STB2-75512F10 suitable for use in cracked concrete?

Yes. The Strong-Bolt 2 is code listed for both cracked and uncracked concrete applications. Its dual undercutting embossments on each clip segment allow for secondary expansion if a crack forms and intersects the anchor location, significantly increasing its ability to carry load even when the hole expands.

What drill bit size is required to install the STB2-75512F10?

Installation requires a 3/4-inch diameter drill bit, matching the anchor's 3/4-inch diameter.

What materials are the components of the Strong-Bolt 2 STB2-75512F10 made from?

The anchor body is carbon steel with a zinc plated finish. The nut is carbon steel conforming to ASTM A 563, Grade A. The washer is carbon steel conforming to ASTM F844, and the clip is carbon steel conforming to ASTM A 568.

Can the STB2-75512F10 be used in seismic and high-wind applications?

Yes. The Strong-Bolt 2 is specifically designed as an optimal choice for high-performance use in seismic and high-wind conditions, in addition to being code listed for cracked and uncracked concrete and masonry applications.

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