The Simpson Strong-Bolt 2 5/8 in. x 8-1/2 in. Mechanically Galvanized Wedge Anchor is a wedge-type expansion anchor from Simpson engineered for high-load concrete and masonry fastening in exterior environments. Built from mechanically galvanized carbon steel, this anchor delivers dependable corrosion resistance where uncoated steel would be vulnerable to degradation. Dual undercutting embossments on each clip segment enhance holding performance, and the anchor is tested in uncracked concrete per AC193 and in uncracked masonry per AC01 - giving engineers and installers a rigorously verified fastening solution for demanding structural applications.

Key Features

• Dual undercutting embossments on each clip segment - increases mechanical interlock with the base material for stronger, more reliable holding capacity in high-load applications
• Mechanically galvanized carbon steel construction - provides corrosion resistance suited to exterior, exposed, and moisture-prone environments where anchor longevity is critical
• Chamfered top design - prevents mushrooming during installation so the anchor seats cleanly without damage to the fastener or fixture
• Suitable for horizontal, vertical, and overhead installations - gives contractors flexibility to use a single anchor type across multiple orientations on the same job
• Standard ANSI fractional sizing at 5/8 in. diameter - fits standard fixtures and installs with a common 5/8 in. drill bit and 15/16 in. wrench, reducing the need for specialty tooling
• Tested per ACI355.2 and AC193 in uncracked concrete, and per AC01 in uncracked masonry - independently verified performance gives project teams the documentation needed for code-compliant exterior fastening applications

Why This Product

• Built for exterior high-load use - the mechanically galvanized finish is specifically designed to protect against corrosion in exposed conditions, making this anchor a practical choice for outdoor structural connections where load resistance and durability must coexist
• Tested across concrete and masonry substrates - with testing conducted in uncracked concrete per AC193 and uncracked masonry per AC01, this anchor covers a broader range of base materials than anchors evaluated in a single substrate, supporting design confidence across common exterior applications
• Installs with common tools and no special preparation - the 5/8 in. drill bit requirement matches the anchor diameter exactly, and standard wrench sizing means crews can install without sourcing specialty equipment, keeping projects on schedule
• Engineered details that protect the installation - the chamfered top prevents mushrooming and the dual undercutting clip design works consistently across horizontal, vertical, and overhead orientations, reducing the risk of installation errors on complex or multi-angle structural work

Specifications

• Model Number: STB2-62812MGF20
• Size: 5/8 in. x 8-1/2 in.
• Drill Bit Diameter: 5/8 in.
• Thread Length: 4-15/16 in.
• Coating / Material: Mechanically Galvanized / Carbon Steel
• 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 20 and Cartons of 40

Approved Applications

• Exterior concrete fastening 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 finish does the STB2-62812MGF20 anchor have, and why does it matter?

The anchor features a mechanically galvanized finish on its carbon steel body. This coating is specifically designed to provide corrosion resistance, making the anchor appropriate for exterior and exposed applications where uncoated steel would be at risk of degradation.

What drill bit size is required to install this anchor?

A 5/8-inch diameter drill bit is required to create the properly sized hole for this anchor. Using the correct drill bit diameter ensures the wedge expansion mechanism functions as intended for a secure hold.

Has this anchor been independently tested for performance?

Yes. The Strong-Bolt 2 mechanically galvanized anchor has been tested in uncracked concrete in accordance with AC193 and also in uncracked masonry in accordance with AC01, providing verified load-resistance data for engineering and installation purposes.

Can this anchor be used in overhead or horizontal orientations, or only vertically?

This anchor is suitable for horizontal, vertical, and overhead applications, giving installers flexibility across a wide range of structural fastening scenarios.

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