Simpson Strong-Bolt 2 Wedge Anchor - 3/4 in. x 5-1/2 in. - Type 304 Stainless Steel is a high-performance wedge-type expansion anchor engineered for demanding structural applications in both cracked and uncracked concrete. Built from Type 304 stainless steel throughout, this anchor delivers lasting corrosion resistance in a wide variety of service environments - making it a reliable choice for exterior, coastal, and chemically exposed installations. Qualified for static and seismic loading conditions across seismic design categories A through F, the Strong-Bolt 2 is purpose-built for high-wind zones and seismic regions where anchor performance under load is critical.

Key Features

• Code listed for cracked and uncracked concrete applications - gives engineers and inspectors confidence that the anchor meets code requirements for the broadest range of concrete conditions
• Dual undercutting embossments on each clip segment enable secondary expansion if a crack intersects the anchor hole - significantly increases load-carrying capacity if the concrete opening expands over time
• Chamfered top design prevents mushrooming during installation - reduces installation errors and ensures a clean, flush seating for fixtures
• Qualified for static and seismic loading conditions, seismic design categories A through F - suitable for use in earthquake-prone regions and high-wind construction zones
• Suitable for horizontal, vertical, and overhead applications - provides installation flexibility across structural orientations without a separate anchor specification
• Standard ANSI fractional sizing - fits standard fixtures and installs with common drill bit and tool sizes, eliminating the need for specialty tooling
• Tested per ACI355.2 and AC193 - independently verified performance gives specifiers and contractors third-party validated load data to work from
• Made entirely from Type 304 stainless steel - resists corrosion in outdoor, wet, and chemically active environments for long service life
• Fully assembled out of the box - saves time on the job site by eliminating component assembly before installation

Why This Product

• When concrete cracks at an anchor location - due to seismic events, loading, or settling - the dual undercutting embossments provide secondary expansion so the anchor continues to carry load, rather than losing capacity the moment a crack forms. This makes Strong-Bolt 2 an engineered solution for long-term structural integrity in demanding conditions.
• Type 304 stainless steel construction throughout the anchor body, nut, washer, and clip provides corrosion resistance well beyond standard zinc-plated anchors, making this the right choice for outdoor, waterfront, or chemically exposed concrete applications where carbon steel anchors would deteriorate prematurely.
• Full compliance with ACI355.2 and AC193 testing standards, combined with code listing for both cracked and uncracked concrete, means this anchor is accepted by inspectors and engineers in jurisdictions that require third-party verified anchor systems - reducing submittal friction on regulated projects.
• Standard 3/4 in. drill bit compatibility and ANSI fractional sizing means no specialty tools are needed - contractors can use the same bits and hardware they already carry, speeding up installation in both vertical and overhead orientations.

Specifications

• Brand: Simpson Strong-Tie
• Diameter: 3/4 in.
• Length: 5 1/2 in.
• Thread Length: 3 3/16 in.
• Drill Bit Diameter: 3/4 in.
• Material: Type 304 Stainless Steel
• Finish: Type 304 Stainless Steel

Available Pack Options

• STB2-755124SS: 10 Pk
• STB2-755124SS -4P: 40 Pk

Install With

• Installs with 3/4 in. drill bit and 1-1/8 in. wrench size

Frequently Asked Questions

Can the Strong-Bolt 2 be used in cracked concrete?

Yes. This anchor is code listed for both cracked and uncracked concrete applications. The dual undercutting embossments on each clip segment provide secondary expansion if a crack forms and intersects the anchor location, helping maintain load-carrying capacity under those conditions.

Is this anchor rated for seismic and high-wind applications?

Yes. The Strong-Bolt 2 is qualified for static and seismic loading conditions, covering seismic design categories A through F. It is designed to perform in high-wind conditions and is tested per ACI355.2 and AC193.

Why choose Type 304 stainless steel for a wedge anchor?

Type 304 stainless steel offers long-lasting corrosion resistance suitable for a wide variety of service environments - including outdoor installations, wet conditions, and settings where carbon steel or zinc-plated anchors would corrode over time. The anchor body, nut, and washer are all made from Type 304 stainless steel for consistent material performance throughout.

What orientations can this anchor be installed in?

The Strong-Bolt 2 is suitable for horizontal, vertical, and overhead concrete anchor applications, giving installers flexibility across a wide range of structural configurations without needing a different anchor type for each orientation.