The Simpson Strong-Bolt 2 Wedge Anchor (1/2 in. x 2-3/4 in.) is a wedge-type expansion anchor from Simpson engineered for high-performance structural fastening in cracked and uncracked concrete. Built for demanding conditions, this carbon steel anchor incorporates dual undercutting embossments on each clip segment that enable secondary expansion should a crack form and intersect the anchor location - significantly increasing load-carrying ability if the hole expands. With a zinc-plated finish and qualification for seismic design categories A through F, this wedge anchor is a dependable choice for contractors and builders tackling critical horizontal, vertical, and overhead concrete fastening applications.

Key Features

• Chamfered top - prevents mushrooming during installation, keeping the anchor flush and the installation clean without damage to the fastener head.
• Dual undercutting embossments on each clip segment - enable secondary expansion if a crack intersects the anchor location, maintaining load capacity even when the base material is compromised.
• Qualified for seismic design categories A through F - gives engineers and inspectors confidence that this anchor meets code requirements for seismic and high-wind structural connections.
• Tested per ACI355.2 and AC193 - independently verified performance standards mean the anchor's ratings are backed by recognized third-party testing, not just manufacturer claims.
• Suitable for horizontal, vertical, and overhead applications - a single anchor solution adaptable to virtually any installation orientation on the job site.
• Zinc-plated carbon steel construction - provides a corrosion-resistant finish appropriate for interior and protected concrete fastening applications.

Why This Product

• Built for seismic and high-wind zones - the Strong-Bolt 2 is specifically engineered and tested for both static and seismic loading conditions, making it a trustworthy choice on projects where code compliance in challenging environments is non-negotiable.
• Secondary expansion technology protects your connection - the dual undercutting embossments allow the anchor to maintain load-carrying performance even after cracking occurs at the anchor location, a critical advantage in concrete that can shift or settle over time.
• Versatile installation options - rated for cracked and uncracked concrete, masonry, and multiple installation orientations, this expansion anchor reduces the need to source different fasteners for different conditions on the same job.
• Installs with standard tools - compatible with a 1/2 in. drill bit and a 3/4 in. wrench, so no specialty equipment is required, keeping installation straightforward and efficient.

Specifications

• Size: 1/2 in. x 2-3/4 in.
• MPN: STB2-50234R25
• Brand: Simpson Strong-Tie
• Diameter: 1/2 in.
• Length: 2-3/4 in.
• Thread Length: 1-1/4 in.
• Material: Carbon Steel
• Coating / Finish: Zinc Plated
• Installation: Installs with 1/2 in. drill bit and 3/4 in. wrench size
• Packaging: Packs of 25 and Cartons of 125
• Drill Bit Diameter: 1/2 in.

Approved Applications

• Cracked and uncracked concrete applications
• Masonry applications
• Static loading conditions
• Seismic loading conditions (seismic design categories A through F)
• High-wind structural connections
• Horizontal, vertical, and overhead installations

Frequently Asked Questions

What tools are needed to install the Strong-Bolt 2 wedge anchor?

The Strong-Bolt 2 installs with a 1/2 in. drill bit and a 3/4 in. wrench size, making installation straightforward with standard tools.

Is this anchor rated for seismic applications?

Yes. The Strong-Bolt 2 is qualified for both static and seismic loading conditions, covering seismic design categories A through F, and has been tested per ACI355.2 and AC193.

What happens if a crack forms in the concrete at the anchor location?

The dual undercutting embossments on each clip segment enable secondary expansion should a crack form and intersect the anchor location. This feature significantly increases the ability of Strong-Bolt 2 to carry load if the hole expands.

Can this anchor be used in overhead applications?

Yes. The Strong-Bolt 2 is suitable for horizontal, vertical, and overhead applications, and its chamfered top is designed to prevent mushrooming during installation regardless of orientation.

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