The Simpson Strong-Bolt 2 wedge anchor in 3/4 in. x 5-1/2 in. is a high-performance wedge-type expansion anchor built for demanding concrete fastening applications where reliability under seismic and high-wind conditions is non-negotiable. Constructed from Type 316 stainless steel throughout - including the anchor body, nut, washer, and clip - this anchor delivers long-lasting corrosion resistance across a wide variety of service environments, making it a dependable solution for structural connections exposed to moisture, chemicals, or other corrosive conditions. It installs with a 3/4 in. drill bit and a 1-1/8 in. wrench, fitting standard fixtures and common tooling right out of the box.

Key Features

• Dual undercutting embossments on each clip segment - enables secondary expansion if a crack forms and intersects the anchor location, significantly increasing the anchor's ability to carry load if the hole expands in cracked concrete
• Code listed for cracked and uncracked concrete applications - gives engineers and installers confidence the anchor meets code requirements across a broad range of concrete conditions
• Qualified for static and seismic loading conditions (seismic design categories A through F) - suitable for use in the most demanding seismic zones, reducing the need for project-specific engineering workarounds
• Chamfered top designed to prevent mushrooming during installation - protects the anchor threads during driving so the nut seats cleanly and installation stays on schedule
• Suitable for horizontal, vertical, and overhead applications - offers installation flexibility across a full range of concrete anchoring orientations on any jobsite
• Standard (ANSI) fractional sizes - fits standard fixtures and installs with common drill bit and tool sizes, eliminating the need for specialty equipment
• Tested per ACI 355.2 and AC193 - independently verified performance gives specifiers and inspectors a documented basis for approval
• Full Type 316 stainless steel construction - provides long-lasting corrosion resistance suited for outdoor, coastal, and chemically exposed service environments where carbon steel hardware would degrade

Why This Product

• Built for high-stakes structural applications - qualified for seismic design categories A through F and tested per ACI 355.2 and AC193, this wedge anchor meets the performance requirements that structural engineers and inspectors look for on critical concrete connections in high-wind and seismic zones
• Performs in cracked concrete without guesswork - the dual undercutting embossments provide secondary expansion if cracking occurs at the anchor location, so load capacity is maintained even when concrete conditions change after installation
• All-stainless construction resists corrosion at every point of contact - with Type 316 stainless steel used for every component, there are no mixed-material weak points that could corrode and compromise the connection in wet, coastal, or chemically active environments
• Installs with standard tools in any orientation - the chamfered top, ANSI fractional sizing, and compatibility with horizontal, vertical, and overhead placements mean fewer complications on the job and no need for specialty tooling or procedures

Specifications

• Model Number: STB2-75512S6F10
• Coating/Material: Type 316 Stainless Steel
• Size: 3/4 in. x 5-1/2 in.
• Drill Bit Diameter: 3/4 in.
• Thread Length: 3-3/16 in.
• Anchor Body Material: Type 316 Stainless Steel
• Nut Material: Type 316 Stainless Steel
• Washer Material: Type 316 Stainless Steel
• Clip Material: Type 316 Stainless Steel
• Packaging: Packs of 10 and Cartons of 40

Approved Applications

• Cracked concrete installations
• Uncracked concrete installations
• Seismic zone structural connections
• High-wind condition fastening applications
• Corrosive or moisture-exposed service environments requiring stainless steel hardware

Frequently Asked Questions

Is the Strong-Bolt 2 (STB2-75512S6F10) 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 allow for secondary expansion should a crack form and intersect the anchor location, significantly increasing the anchor's ability to carry load if the hole expands.

Why is Type 316 stainless steel used for all components of this anchor?

Type 316 stainless steel is used for the anchor body, nut, washer, and clip because it offers long-lasting corrosion resistance for a wide variety of service environments. This all-stainless construction is especially important in applications exposed to moisture, chemicals, or outdoor conditions.

What drill bit diameter is required to install this anchor?

A 3/4 in. diameter drill bit is required for proper installation of the STB2-75512S6F10 wedge anchor.

Can this anchor be used in seismic or high-wind applications?

Yes. The Strong-Bolt 2 is designed as an optimal choice for high-performance use even in seismic and high-wind conditions, making it appropriate for structurally demanding environments where code compliance is critical.

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