The Simpson Strong-Bolt 2 Wedge Anchor (1/4 in. x 2-1/4 in., Type 304 Stainless Steel) is a high-performance wedge-type expansion anchor built for demanding structural applications in seismic and high-wind conditions. Each anchor features dual undercutting embossments on every clip segment, enabling secondary expansion should a crack form and intersect the anchor location - significantly increasing the anchor's ability to carry load if the hole expands. Constructed from Type 304 stainless steel, this fully assembled concrete fastener delivers long-lasting corrosion resistance across a wide variety of service environments, making it a reliable choice for both interior and exposed installations.

Key Features

• Code listed for uncracked concrete applications - gives engineers and inspectors the documented compliance they need for permitted structural work.
• Dual undercutting embossments on each clip segment - enable secondary expansion if a crack intersects the anchor, helping the fastener maintain load capacity even as conditions change.
• Chamfered top designed to prevent mushrooming during installation - keeps the anchor head clean and properly formed so nuts seat correctly without rework.
• Qualified for static and seismic loading conditions (seismic design categories A through F) - covers the full range of seismic risk zones, so one anchor specification works across projects in virtually any U.S. region.
• Suitable for horizontal, vertical, and overhead applications - provides installation flexibility so the same anchor can be used throughout a job regardless of orientation.
• Tested per ACI355.2 and AC193 - independent third-party testing standards back the performance data, giving structural designers confidence in the published load values.
• Made from Type 304 stainless steel - provides long-lasting corrosion resistance for use in moisture-exposed, coastal, or other corrosive service environments where carbon steel anchors would degrade.
• Installs with a 1/4 in. drill bit and 7/16 in. wrench - straightforward tooling requirements mean faster setup and no specialty equipment on the job site.

Why This Product

• Built-in load protection when concrete cracks - the dual undercutting embossments trigger secondary expansion automatically if cracking reaches the anchor, a design advantage that helps preserve structural integrity without requiring re-anchoring.
• Full seismic and high-wind qualification (categories A through F) - contractors and engineers working in regulated seismic zones can specify this wedge anchor with confidence, knowing it meets the highest applicable performance thresholds without substitution.
• Type 304 stainless steel construction for lasting durability - ideal for outdoor structures, water treatment facilities, marine-adjacent environments, and any application where corrosion resistance is a primary concern rather than an afterthought.
• Fully assembled and ready to install - the anchor ships pre-assembled, reducing on-site prep time and the risk of missing components during installation.

Specifications

• Size: 1/4 in. x 2-1/4 in.
• Manufacturer: Simpson Strong-Tie
• MPN: STB2-25214S4F100
• Material: Type 304 Stainless Steel
• Finish: Type 304 Stainless Steel
• Diameter: 1/4 in.
• Length: 2-1/4 in.
• Thread Length: 1-7/16 in.
• Installation Drill Bit: 1/4 in.
• Wrench Size: 7/16 in.
• Assembly: Fully Assembled
• Packaging: Packs of 100 and Cartons of 400

Approved Applications

• Uncracked concrete applications (code listed)
• Horizontal installations
• Vertical installations
• Overhead installations
• Seismic design categories A through F
• Static and seismic loading conditions
• High-wind structural environments
• Corrosive or moisture-exposed service environments requiring stainless steel

Frequently Asked Questions

What type of concrete is the Strong-Bolt 2 code listed for?

The Simpson Strong-Bolt 2 wedge anchor is code listed for uncracked concrete applications and has been tested per ACI355.2 and AC193 to confirm compliance.

Is this anchor suitable for seismic applications?

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

What tools are needed to install this wedge anchor?

The Strong-Bolt 2 1/4 in. x 2-1/4 in. anchor installs with a 1/4 in. drill bit and requires a 7/16 in. wrench size for tightening.

Why is Type 304 stainless steel used for this anchor?

Type 304 stainless steel provides long-lasting corrosion resistance, making the Strong-Bolt 2 suitable for a wide variety of service environments where moisture, chemicals, or other corrosive conditions may be present.

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