The Simpson Strong-Bolt 2 1/4 in. x 2 1/4 in. Wedge Anchor in Type 316 Stainless Steel is a wedge-type expansion anchor engineered for high-performance concrete fastening in demanding structural, seismic, and corrosive environments. Built entirely from Type 316 stainless steel - anchor body, nut, washer, and clip - this anchor delivers long-lasting corrosion resistance suited to a wide variety of service environments. Its dual undercutting embossments enable secondary expansion if a crack intersects the anchor location, keeping the connection load-bearing even as conditions change. Sized to ANSI fractional standards, it installs with a 1/4 in. drill bit and a 7/16 in. wrench, fitting common fixtures and tooling without special setup.

Key Features

• Dual undercutting embossments on each clip segment - 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, giving you reliable performance in cracked concrete.
• Qualified for static and seismic loading conditions (seismic design categories A through F) - meets the requirements for code-listed seismic and high-wind applications, so engineers and inspectors can approve your installation with confidence.
• Chamfered top design - prevents mushrooming during installation, protecting thread integrity and making removal or re-torquing straightforward.
• Suitable for horizontal, vertical, and overhead applications - gives you a single anchor solution across multiple orientations and jobsite scenarios without switching products.
• Standard ANSI fractional sizing - fits standard fixtures and installs with common drill bit and tool sizes, reducing the need for specialty equipment on the job.
• Tested per ACI355.2 and AC193 - independently verified performance data backs every installation, supporting code compliance on commercial and residential projects alike.
• Full Type 316 stainless steel construction throughout all components - provides long-lasting corrosion resistance in moisture-exposed, chemical-rich, and coastal service environments where carbon steel anchors would degrade.

Why This Product

• Built for cracked and uncracked concrete alike - the dual undercutting embossment design actively responds to crack formation at the anchor location, maintaining load capacity in conditions where standard wedge anchors may lose holding strength.
• Covers the full seismic spectrum - with qualification across seismic design categories A through F and testing per ACI355.2 and AC193, this anchor satisfies code requirements on projects where seismic and high-wind performance must be documented.
• All-316 stainless steel throughout every component - by using Type 316 stainless steel for the body, nut, washer, and clip, the anchor resists galvanic inconsistency and corrosion at every point of contact, making it a sound choice for long-term installations in harsh or outdoor environments.
• Installs without specialty tooling - the ANSI fractional 1/4 in. sizing works with a standard 1/4 in. drill bit and a 7/16 in. wrench, keeping installation fast and straightforward for both field crews and contractors managing multiple anchor types on a single site.

Specifications

• Model No.: STB2-25214S6F100
• Coating/Material: Type 316 Stainless Steel
• Size: 1/4 in. x 2-1/4 in.
• Drill Bit Diameter: 1/4 in.
• Thread Length: 1-7/16 in.
• Component Material, Anchor Body: Type 316 Stainless Steel
• Component Material, Nut: Type 316 Stainless Steel
• Component Material, Washer: Type 316 Stainless Steel
• Component Material, Clip: Type 316 Stainless Steel
• Packaging: Packs of 100 and Cartons of 500

Approved Applications

• Cracked concrete installations
• Uncracked concrete installations
• Seismic applications requiring code-listed anchors
• High-wind condition fastening applications
• Corrosive or moisture-exposed service environments

Frequently Asked Questions

Is the Strong-Bolt 2 (STB2-25214S6F100) suitable for use in cracked concrete?

Yes. The Strong-Bolt 2 is code listed for both cracked and uncracked concrete applications. Its dual undercutting embossments on each clip segment enable secondary expansion should a crack form and intersect the anchor location, significantly increasing its ability to carry load even if the hole expands.

Why is Type 316 stainless steel used for this anchor?

Type 316 stainless steel offers long-lasting corrosion resistance for a wide variety of service environments, making it an ideal choice for applications exposed to moisture, chemicals, or other corrosive conditions. All components - including the anchor body, nut, washer, and clip - are constructed from Type 316 stainless steel.

What drill bit size is required to install the STB2-25214S6F100?

A 1/4-inch diameter drill bit is required to install this anchor.

Is this anchor appropriate for seismic or high-wind applications?

Yes. The Strong-Bolt 2 wedge-type expansion anchor is an optimal choice for high-performance use even in seismic and high-wind conditions, and it is code listed for these demanding environments.

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