The Simpson Strong-Bolt 2 Wedge Anchor in 1/2 in. x 8 1/2 in. Mechanically Galvanized is a wedge-type expansion anchor built for high-load-resisting performance in exterior concrete and masonry applications. Constructed from mechanically galvanized carbon steel, it delivers enhanced corrosion resistance suited to demanding outdoor environments. Dual undercutting embossments on each clip segment provide exceptional holding strength, and the anchor is tested in uncracked concrete per AC193 and in uncracked masonry per AC01 - giving contractors and builders a rigorously verified fastening solution for critical structural connections.

Key Features

• Chamfered top designed to prevent mushrooming during installation - protects the anchor head from deformation so the nut seats cleanly and the connection maintains full load-bearing integrity.
• Suitable for horizontal, vertical, and overhead applications - provides installation flexibility across a wide range of structural anchoring scenarios without requiring a separate anchor for each orientation.
• Standard ANSI fractional sizing - fits standard fixtures and installs with a common 1/2 in. drill bit and 3/4 in. wrench, reducing the need for specialized tooling on the job site.
• Tested per ACI355.2 and AC193 - independently verified performance standards give engineers and inspectors the documentation needed for code-compliant installations.
• Mechanically galvanized carbon steel construction - provides a higher level of corrosion resistance than standard zinc-electroplated anchors, making this anchor appropriate for exterior and high-moisture environments.

Why This Product

• Engineered for exterior and high-load anchoring - the mechanically galvanized finish goes beyond standard electroplating, making this wedge anchor a dependable choice when corrosion resistance and structural holding strength are both required in outdoor or exposed conditions.
• Versatile across orientations and base materials - tested and approved for use in uncracked concrete and uncracked masonry in horizontal, vertical, and overhead positions, this anchor adapts to a broad range of commercial and structural fastening applications with a single product.
• Dual undercutting embossments on each clip segment - this design detail, shared with the zinc-electroplated Strong-Bolt 2 series, is engineered to maximize mechanical interlock within the base material, supporting consistent and reliable load transfer under demanding conditions.
• Drops into standard workflows without added complexity - ANSI fractional sizing means this anchor pairs with everyday drill bits and hand tools, helping crews maintain productivity without sourcing specialty equipment or adapters.

Specifications

• Size: 1/2 in. x 8-1/2 in.
• MPN: STB2-50812MGF20
• Brand: Simpson Strong-Tie
• Diameter: 1/2 in.
• Length: 8-1/2 in.
• Thread Length: 6 in.
• Material: Carbon Steel
• Coating: Mechanically Galvanized
• Finish: Mechanically Galvanized
• Installation: Installs with 1/2 in. drill bit and 3/4 in. wrench size
• Packaging: Packs of 20 and Cartons of 40
• Drill Bit Diameter: 1/2 in.

Approved Applications

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

Frequently Asked Questions

What drill bit size is required to install the STB2-50812MGF20?

The STB2-50812MGF20 installs with a 1/2 in. drill bit and requires a 3/4 in. wrench size for tightening, conforming to standard ANSI fractional sizing for compatibility with common tools and fixtures.

Is this wedge anchor suitable for outdoor and exterior use?

Yes. The mechanically galvanized carbon steel construction makes this anchor appropriate for exterior applications where enhanced corrosion resistance is required compared to standard zinc-electroplated anchors.

In what orientations can the Strong-Bolt 2 wedge anchor be installed?

The STB2-50812MGF20 is suitable for horizontal, vertical, and overhead applications, providing installation flexibility across a wide range of structural anchoring scenarios.

What standards has this anchor been tested to?

The Strong-Bolt 2 mechanically galvanized anchor is tested per ACI355.2 and AC193 for uncracked concrete, and also per AC01 for uncracked masonry, ensuring verified performance across both substrate types.

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