The Simpson Strong-Bolt 2 1/2 in. x 3-3/4 in. Mechanically Galvanized Wedge Anchor is a wedge-type expansion anchor built for exterior concrete and masonry fastening where high load resistance is required. Constructed from carbon steel with a mechanically galvanized finish, this anchor delivers reliable holding performance in uncracked concrete and uncracked masonry alike. Dual undercutting embossments on each clip segment enhance grip, and the anchor is tested in uncracked concrete per AC193 and in uncracked masonry per AC01 - making it a dependable choice for structural anchoring in demanding conditions.

Key Features

• Mechanically galvanized carbon steel construction - provides corrosion resistance suited for exterior and outdoor anchoring applications
• Dual undercutting embossments on each clip segment - increase mechanical interlock with the base material for improved load performance and holding strength
• Chamfered top design - prevents mushrooming during installation, helping the anchor seat cleanly and reducing the risk of installation damage
• Suitable for horizontal, vertical, and overhead applications - gives installers flexibility across a wide range of structural fastening orientations
• Standard ANSI fractional sizing at 1/2 in. diameter - installs with a common 1/2 in. drill bit and 3/4 in. wrench, so no specialized tooling is required
• Tested per ACI355.2 and AC193 - independent testing in uncracked concrete and uncracked masonry provides documented performance data for confident specification

Why This Product

• Built for exterior high-load applications - the mechanically galvanized finish and wedge-type expansion design work together to deliver the corrosion resistance and holding strength that exterior structural anchoring demands
• Verified performance in concrete and masonry - tested in uncracked concrete per AC193 and in uncracked masonry per AC01, this anchor comes with documented proof of performance rather than relying on unverified claims
• Installs with standard tools - ANSI fractional sizing means a common 1/2 in. drill bit and 3/4 in. wrench are all that is needed, keeping installation straightforward and efficient on the job site
• Engineered details that protect the installation - the chamfered top prevents mushrooming and the dual undercutting clip embossments maximize grip, so each anchor performs as intended from installation through service life

Specifications

• Model Number: STB2-50334MGF25
• Size: 1/2 in. x 3-3/4 in.
• Coating/Material: Mechanically Galvanized / Carbon Steel
• Drill Bit Diameter: 1/2 in.
• Thread Length: 2-1/16 in.
• Anchor Body Material: Mechanically Galvanized Carbon Steel
• Nut Material: Carbon Steel ASTM A 563, Grade A
• Washer Material: Carbon Steel ASTM F844
• Clip Material: Carbon Steel ASTM A 568
• Packaging: Packs of 25 and Cartons of 125

Approved Applications

• Exterior applications requiring high load resistance
• Uncracked concrete (tested per AC193)
• Uncracked masonry (tested per AC01)
• Horizontal installations
• Vertical installations
• Overhead installations

Frequently Asked Questions

What size drill bit is required to install this anchor?

A 1/2 in. diameter drill bit is required for installation of this wedge anchor.

Is this anchor suitable for outdoor or exterior use?

Yes. The mechanically galvanized finish on the anchor body makes it appropriate for exterior applications where corrosion resistance is needed.

Can this anchor be installed in overhead or horizontal orientations?

Yes. The Strong-Bolt 2 is suitable for horizontal, vertical, and overhead applications.

What base materials has this anchor been tested in?

This anchor has been tested in uncracked concrete in accordance with AC193 and in uncracked masonry in accordance with AC01.

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