The Simpson Strong-Bolt 2 Wedge Anchor in 3/4 in. x 7 in., Type 304 Stainless Steel is a high-performance expansion anchor engineered for demanding structural applications in both cracked and uncracked concrete. Designed by Simpson - a trusted name in structural fastening - this wedge-type expansion anchor delivers reliable holding strength under static loading, seismic events, and high-wind conditions. The Type 304 stainless steel construction provides long-lasting corrosion resistance, making it well suited for wet, coastal, and other harsh service environments where standard carbon steel anchors would be vulnerable to degradation.

Key Features

• Code listed for cracked and uncracked concrete applications - gives engineers and inspectors confidence that the anchor meets recognized code requirements for both substrate conditions
• Dual undercutting embossments on each clip segment enable secondary expansion if a crack intersects the anchor location - significantly increases load-carrying ability when the hole expands, adding a critical safety margin
• Chamfered top design prevents mushrooming during installation - results in a cleaner, faster install without damaging the anchor or surrounding concrete surface
• Qualified for static and seismic loading conditions, seismic design categories A through F - suitable for high-seismic zones and regions subject to high-wind loading
• Suitable for horizontal, vertical, and overhead applications - provides flexible installation orientation for a wide range of structural anchoring tasks
• Standard ANSI fractional sizing at 3/4 in. diameter - fits standard fixtures and works with common drill bit and tool sizes already on the job site
• Tested per ACI355.2 and AC193 - independently validated performance data supports engineered design and code compliance submittals
• Type 304 stainless steel material throughout the anchor body, nut, and washer - resists rust and corrosion in wet, coastal, and chemically active environments where long service life is required
• Fully assembled configuration - ready to install straight out of the package, reducing prep time on the job

Why This Product

• Built for seismic and high-wind zones - the Strong-Bolt 2 is specifically qualified for seismic design categories A through F, making it one of the few wedge anchors suited for the most demanding structural code requirements without requiring a special-order engineered solution
• Secondary expansion capability adds a real safety margin - unlike standard wedge anchors, the dual undercutting embossments allow the clips to expand a second time if a crack develops at the anchor location, helping the fastener maintain load capacity in aging or stressed concrete
• Type 304 stainless steel is the right material for corrosive service environments - where galvanized or plain steel anchors can fail prematurely due to rust, the stainless steel construction of this anchor provides durable, long-term performance in outdoor, marine-adjacent, and moisture-prone conditions
• Installs with common tools and standard drill bits - the 3/4 in. ANSI fractional sizing means no specialty tooling is required, keeping installation straightforward and compatible with equipment already on site

Specifications

• Brand: Simpson Strong-Tie
• Diameter: 3/4 in.
• Length: 7 in.
• Drill Bit Diameter: 3/4 in.
• Thread Length: 4 11/16 in.
• Material: Type 304 Stainless Steel
• Finish: Type 304 Stainless Steel

Available Pack Options

• STB2-757004SS: 10 Pk
• STB2-757004SS -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. 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 if a crack forms and intersects the anchor location, which significantly increases the anchor's ability to carry load even when the hole expands.

What seismic design categories is this anchor approved for?

The Strong-Bolt 2 is qualified for static and seismic loading conditions covering seismic design categories A through F - the full range of seismic design categories used in U.S. building codes - as well as high-wind applications.

What drill bit and wrench size are needed for installation?

This anchor installs with a 3/4 in. drill bit and requires a 1-1/8 in. wrench size. The standard ANSI fractional sizing means it is compatible with common drill bits and tools typically found on job sites, without requiring specialty equipment.

Why is Type 304 stainless steel specified for this anchor?

Type 304 stainless steel provides long-lasting corrosion resistance suitable for a wide variety of service environments, including wet, coastal, and other harsh conditions where standard carbon steel or even galvanized anchors may degrade prematurely. This makes the stainless version appropriate when extended service life and corrosion performance are required by design or environmental conditions.