The Simpson Strong-Bolt 2 1/2 in. x 2 3/4 in. Mechanically Galvanized Wedge Anchor is a wedge-type expansion anchor built for high-load-resisting performance in exterior concrete and masonry installations. Manufactured by Simpson from carbon steel with a mechanically galvanized finish, this anchor features dual undercutting embossments on each clip segment for reliable mechanical interlock, and has been tested in uncracked concrete per AC193 and in uncracked masonry per AC01 - making it a dependable choice for structural anchoring where corrosion resistance and verified load capacity are both required.

Key Features

• Mechanically galvanized carbon steel construction - provides enhanced corrosion resistance over standard zinc-electroplated finishes, keeping the anchor better protected in exterior and moisture-exposed environments
• Dual undercutting embossments on each clip segment - improves mechanical interlock within the base material for stronger, more consistent holding power under load
• 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 the flexibility to use a single anchor type across multiple orientations on the same job
• Standard ANSI fractional sizing at 1/2 in. diameter - fits standard fixtures and works with common 1/2 in. drill bits and a 3/4 in. wrench, minimizing the need for specialty tooling
• Tested per ACI355.2 and AC193 in uncracked concrete, and per AC01 in uncracked masonry - gives engineers and installers documented, code-relevant performance data to support project approvals with confidence

Why This Product

• Built specifically for exterior high-load anchoring - the mechanically galvanized finish paired with a carbon steel body makes this wedge anchor a practical choice for outdoor structural connections where both strength and weather resistance matter
• Versatile across concrete and masonry substrates - independently tested in both uncracked concrete and uncracked masonry, this anchor covers a wider range of common base materials than anchors rated for only one substrate type
• Multi-orientation rated - approved for horizontal, vertical, and overhead use, so one anchor solution works across varying installation conditions without needing to source different products for different placements
• Tool-friendly standard sizing - the 1/2 in. drill bit requirement and 3/4 in. wrench size align with tools already on most job sites, reducing setup time and keeping installation straightforward

Specifications

• Model No.: STB2-50234MGF25
• Coating/Material: Mechanically Galvanized / Carbon Steel
• Size (in.): 1/2 in. x 2-3/4 in.
• Drill Bit Dia. (in.): 1/2 in.
• Thread Length (in.): 1-1/4 in.
• Component Material, Anchor Body: Mechanically Galvanized
• 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 25 and Cartons of 125

Approved Applications

• Exterior concrete anchoring applications requiring high load resistance
• Uncracked concrete installations - tested per AC193
• Uncracked masonry installations - tested per AC01
• Horizontal anchor installations
• Vertical anchor installations
• Overhead anchor installations

Frequently Asked Questions

What type of finish does this anchor have, and why does it matter?

The anchor body features a mechanically galvanized finish over carbon steel. This coating provides enhanced corrosion resistance compared to standard zinc-electroplated finishes, making it particularly well suited for exterior applications where exposure to moisture and the elements is a concern.

What size hole should be drilled when installing this anchor?

A 1/2-inch diameter drill bit should be used to prepare the installation hole, matching the anchor's 1/2-inch diameter for a proper fit and optimal load performance.

Has this anchor been independently tested for performance in concrete and masonry?

Yes. The STB2-50234MGF25 anchor has been tested in uncracked concrete in accordance with AC193 and in uncracked masonry in accordance with AC01, providing verified performance data for structural applications.

Can this anchor be installed in orientations other than vertical?

Yes. This anchor is suitable for horizontal, vertical, and overhead applications, giving installers flexibility across a wide range of structural configurations and project requirements.

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