The Simpson Strong-Bolt 2 Wedge Anchor in 1/4 in. x 3 1/4 in. Mechanically Galvanized is a wedge-type expansion anchor engineered for high-load-resisting performance in exterior concrete and masonry applications. Built from mechanically galvanized carbon steel, this anchor delivers enhanced corrosion resistance suited to outdoor conditions, while dual undercutting embossments on each clip segment maximize holding strength. Tested per ACI355.2 and AC193 in uncracked concrete, and per AC01 in uncracked masonry, it is designed to meet demanding structural requirements across horizontal, vertical, and overhead installations.

Key Features

• Chamfered top design - prevents mushrooming during installation, resulting in a cleaner drive and reduced risk of installation damage
• Mechanically galvanized carbon steel construction - provides superior corrosion resistance compared to standard zinc-electroplated anchors, making this wedge anchor well suited for exterior and high-moisture environments
• Dual undercutting embossments on each clip segment - improve mechanical interlock with the base material for reliable, high-load holding performance in concrete and masonry
• Suitable for horizontal, vertical, and overhead applications - gives installers flexibility across a wide range of structural anchoring scenarios without requiring a different anchor for each orientation
• Standard ANSI fractional sizing - installs with a common 1/4 in. drill bit and a 7/16 in. wrench, so no specialty tooling is needed and the anchor fits standard fixtures right out of the package
• Tested per ACI355.2 and AC193 in uncracked concrete, and per AC01 in uncracked masonry - provides the documentation and compliance assurance required for structural and code-sensitive projects

Why This Product

• Built for exterior structural anchoring - the mechanically galvanized finish is specifically intended where enhanced corrosion resistance is required, making this anchor a dependable choice for outdoor concrete and masonry connections that standard electroplated anchors may not adequately protect
• Versatile installation orientations in a single anchor - rated for horizontal, vertical, and overhead use in both concrete and masonry, this expansion anchor reduces the need to source multiple products for a single job site
• Code-compliant testing for peace of mind - independent testing per ACI355.2, AC193, and AC01 gives engineers, contractors, and inspectors traceable performance data to support project approvals and structural specifications
• Installs with tools already on hand - the 1/4 in. drill bit and 7/16 in. wrench requirements align with common trade sizes, simplifying procurement and keeping installation straightforward on concrete anchoring projects

Specifications

• Size: 1/4 in. x 3-1/4 in.
• MPN: STB2-25314MGF100
• Brand: Simpson Strong-Tie
• Material: Carbon Steel
• Coating / Finish: Mechanically Galvanized
• Diameter: 1/4 in.
• Length: 3-1/4 in.
• Thread Length: 2-7/16 in.
• Installation Drill Bit Size: 1/4 in.
• Wrench Size: 7/16 in.
• Packaging: Packs of 100 and Cartons of 500

Approved Applications

• High-load exterior concrete anchoring applications
• Horizontal installations in concrete and masonry
• Vertical installations in concrete and masonry
• Overhead installations in concrete and masonry
• Uncracked concrete applications tested per AC193
• Uncracked masonry applications tested per AC01

Frequently Asked Questions

What drill bit size is required to install the STB2-25314MGF100 wedge anchor?

The Strong-Bolt 2 wedge anchor installs with a 1/4 in. drill bit. A 7/16 in. wrench size is used to tighten the assembly during installation.

Is this wedge anchor suitable for outdoor or exterior use?

Yes. The mechanically galvanized finish on the STB2-25314MGF100 is specifically suited for exterior applications where enhanced corrosion resistance is required compared to standard zinc-electroplated anchors.

What orientations can this anchor be installed in?

The Strong-Bolt 2 is suitable for horizontal, vertical, and overhead applications, providing flexibility across a wide range of installation scenarios in concrete and masonry.

What standards has this anchor been tested to?

The STB2-25314MGF100 has been tested per ACI355.2 and AC193 in uncracked concrete, and also in uncracked masonry in accordance with AC01, confirming its performance for structural anchoring applications.

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