The Simpson Strong-Bolt 2 Wedge Anchor (1/4 in. x 2 1/4 in., Zinc Plated) is a wedge-type expansion anchor from Simpson built for high-performance structural fastening in concrete and masonry. Engineered to perform reliably even in seismic and high-wind conditions, it features dual undercutting embossments on each clip segment that enable secondary expansion should a crack form and intersect the anchor location - significantly increasing the anchor's ability to carry load if the hole expands. Whether you are securing structural elements horizontally, vertically, or overhead, this zinc-plated carbon steel anchor delivers the dependability demanded by code-listed applications and challenging job site environments.

Key Features

• Dual undercutting embossments on each clip segment - enable secondary expansion if a crack intersects the anchor location, maintaining load-carrying capacity even when concrete conditions change
• Chamfered top design - prevents mushrooming during installation, allowing cleaner, faster driving without damage to the anchor head
• Code listed for uncracked concrete and masonry applications - gives contractors and engineers the documentation they need for inspections and permit approvals
• Qualified for static and seismic loading conditions (seismic design categories A through F) - suitable for projects in virtually any seismic zone, including high-wind environments where anchor performance is critical
• Suitable for horizontal, vertical, and overhead applications - provides versatility across a wide range of installation orientations without requiring a different anchor for each scenario
• Tested per ACI355.2 and AC193 - independently verified performance gives engineers and inspectors confidence in the anchor's load ratings and reliability
• Zinc-plated carbon steel construction - provides a corrosion-resistant finish appropriate for standard interior and protected concrete fastening applications

Why This Product

• Built for cracked-concrete risk scenarios - the dual undercutting embossments on each clip segment activate secondary expansion if a crack forms at the anchor location, so the connection continues to carry load rather than failing silently
• Full seismic and wind coverage in a compact anchor - qualification across seismic design categories A through F means this 1/4 in. anchor meets the structural demands of the most stringent regional building codes without requiring an upgraded product
• One anchor, three installation orientations - approved for horizontal, vertical, and overhead use, this expansion anchor reduces the need to stock multiple anchor types for a single project
• Straightforward installation with standard tooling - the chamfered top minimizes installation complications, and the anchor is designed to work with commonly available drill and wrench sizes, keeping installation efficient on busy job sites

Specifications

• Model Number: STB2-25214F100
• Size: 1/4 in. x 2-1/4 in.
• Diameter: 1/4 in.
• Length: 2-1/4 in.
• Thread Length: 1-7/16 in.
• Material: Carbon Steel
• Coating: Zinc Plated
• Finish: Zinc Plated
• Installation: Installs with 1/4 in. drill bit and 7/16 in. wrench size
• Packaging: Packs of 100 and Cartons of 500
• Drill Bit Diameter: 1/4 in.

Approved Applications

• Uncracked concrete fastening
• Masonry fastening applications
• Horizontal installations
• Vertical installations
• Overhead installations
• Seismic and high-wind condition environments (seismic design categories A through F)
• Static and seismic loading conditions

Frequently Asked Questions

What size drill bit and wrench are required to install the Strong-Bolt 2 STB2-25214F100?

This anchor installs with a 1/4 in. drill bit and requires a 7/16 in. wrench size for proper installation.

Is the Strong-Bolt 2 suitable for use in seismic conditions?

Yes. The Strong-Bolt 2 is qualified for static and seismic loading conditions, covering seismic design categories A through F, making it an optimal choice for high-performance use even in seismic and high-wind conditions.

Can the Strong-Bolt 2 be installed in overhead or horizontal orientations?

Yes. The Strong-Bolt 2 is suitable for horizontal, vertical, and overhead applications, providing versatility across a wide range of installation scenarios.

What testing standards has the Strong-Bolt 2 been evaluated against?

The Strong-Bolt 2 has been tested per ACI355.2 and AC193, and is code listed for uncracked concrete and masonry applications.

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