The Simpson Strong-Bolt 2 Wedge Anchor in 3/8 in. x 3 3/4 in. Mechanically Galvanized is a wedge-type expansion anchor from Simpson engineered to deliver high-load-resisting performance in exterior concrete and masonry installations. Built from mechanically galvanized carbon steel, this anchor is designed for job sites where corrosion resistance matters - particularly in outdoor and exposed environments. Dual undercutting embossments on each clip segment provide reliable holding power, and the anchor is tested in uncracked concrete per AC193 and in uncracked masonry per AC01, giving structural installers documented confidence in its performance credentials.

Key Features

• Chamfered top designed to prevent mushrooming during installation - protects the anchor head during driving so the fastener seats cleanly without deformation, reducing installation errors and rework.
• Suitable for horizontal, vertical, and overhead applications - gives crews the flexibility to anchor in any orientation on a single job site without switching anchor systems.
• Standard ANSI fractional sizing - installs with a common 3/8 in. drill bit and 9/16 in. wrench, meaning no specialized tooling is required and the anchor fits standard fixtures right off the shelf.
• Mechanically galvanized carbon steel construction - the mechanically galvanized finish provides enhanced corrosion resistance compared to standard electroplating, making this anchor a practical choice for exterior and demanding outdoor applications.
• Tested per ACI355.2 and AC193 in uncracked concrete, and per AC01 in uncracked masonry - third-party evaluation under recognized standards gives engineers and inspectors the documentation needed to specify this anchor with confidence.

Why This Product

• Built for exterior high-load anchoring - the mechanically galvanized finish and high-load-tested design address the two most common demands of exterior structural anchoring in a single product, eliminating the need to source separate solutions for corrosion resistance and load capacity.
• Versatile placement without added complexity - approval for horizontal, vertical, and overhead use means contractors can rely on one anchor throughout a project rather than stocking multiple SKUs for different orientations.
• No specialized tooling required - compatibility with a standard 3/8 in. drill bit and 9/16 in. wrench keeps installation straightforward and accessible to crews already working with common equipment on concrete and masonry jobs.
• Multi-standard tested performance - evaluation under both ACI355.2/AC193 for uncracked concrete and AC01 for uncracked masonry means this wedge anchor covers a broader range of base material conditions, reducing the guesswork when specifying for mixed-substrate projects.

Specifications

• Size: 3/8 in. x 3-3/4 in.
• MPN: STB2-37334MGF50
• Brand: Simpson Strong-Tie
• Anchor Type: Wedge-Type Expansion Anchor
• Diameter: 3/8 in.
• Length: 3-3/4 in.
• Thread Length: 2-5/16 in.
• Material: Carbon Steel
• Coating / Finish: Mechanically Galvanized
• Installation Drill Bit Size: 3/8 in.
• Wrench Size: 9/16 in.
• Testing Standards: ACI355.2, AC193 (uncracked concrete), AC01 (uncracked masonry)
• Packaging: Packs of 50 and Cartons of 250

Approved Applications

• Exterior concrete anchoring where high load resistance is required
• Uncracked concrete installations tested in accordance with AC193
• Uncracked masonry installations tested in accordance with AC01
• Horizontal, vertical, and overhead anchoring applications
• Applications requiring standard ANSI fractional sizing for compatibility with common fixtures and tools

Frequently Asked Questions

What drill bit size is required to install the STB2-37334MGF50?

This anchor installs with a 3/8 in. drill bit and requires a 9/16 in. wrench for tightening - no specialized tooling is needed.

Is this anchor suitable for overhead and horizontal installations, or only vertical?

The Strong-Bolt 2 is suitable for horizontal, vertical, and overhead applications, providing versatile placement options on the job site.

What testing standards has the STB2-37334MGF50 been evaluated under?

This anchor has been tested per ACI355.2 and AC193 for uncracked concrete, and also in uncracked masonry in accordance with AC01, confirming its performance credentials for structural applications.

Why is the mechanically galvanized finish significant for this anchor?

The mechanically galvanized carbon steel construction makes the Strong-Bolt 2 well suited for exterior applications where enhanced corrosion resistance is needed compared to standard zinc-electroplated anchors.

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