The Simpson Strong-Bolt 2 Wedge Anchor in 1/2 in. x 8-1/2 in., Type 304 Stainless Steel is a high-performance expansion anchor engineered for demanding concrete fastening applications - including seismic and high-wind conditions. Built from Type 304 stainless steel throughout, this wedge anchor delivers long-lasting corrosion resistance suitable for a wide variety of service environments, from coastal installations to chemically exposed settings. Dual undercutting embossments on each clip segment allow secondary expansion if a crack intersects the anchor location, significantly increasing load-carrying capacity even when the concrete hole expands. Whether you are securing structural attachments overhead, on vertical walls, or into horizontal slabs, the Strong-Bolt 2 is code listed for both cracked and uncracked concrete - making it a trusted choice for contractors, structural engineers, and installers working under strict building codes.

Key Features

• Type 304 stainless steel construction - provides long-lasting corrosion resistance for demanding service environments, including wet, outdoor, and chemically exposed conditions
• Code listed for cracked and uncracked concrete - meets building code requirements in both new and aged concrete, reducing engineering uncertainty on the jobsite
• Qualified for seismic design categories A through F - gives engineers and contractors confidence that the anchor meets static and seismic loading standards in the most demanding high-wind and earthquake zones
• Dual undercutting embossments on each clip segment - enable secondary expansion if a crack forms and intersects the anchor, maintaining load capacity when the hole enlarges
• Chamfered top design - prevents mushrooming of the anchor head during installation, ensuring a cleaner drive and consistent seating every time
• Standard ANSI fractional sizing at 1/2 in. diameter - fits standard fixtures and installs with common drill bit and tool sizes, reducing the need for specialized equipment
• Suitable for horizontal, vertical, and overhead applications - one anchor covers multiple orientations, cutting down on the number of SKUs needed on a multi-phase project
• Tested per ACI 355.2 and AC193 - independently verified performance standards mean the anchor meets rigorous third-party qualification criteria
• Fully assembled - arrives ready to install with no pre-assembly required, saving time and reducing handling errors on the job
• 6 in. thread length - provides ample thread engagement for a range of fixture thicknesses and embedment depths

Why This Product

• Built for seismic and high-wind environments - the Strong-Bolt 2 is specifically qualified for seismic design categories A through F, making it one of the few wedge anchors appropriate for use in the most stringent code-required structural applications
• Handles cracked concrete without compromise - dual undercutting embossments allow secondary expansion when cracks intersect the anchor, so load capacity is maintained even in aging or stressed concrete structures
• Stainless steel where corrosion matters most - Type 304 stainless steel on the anchor body, nut, washer, and clip means this fastener resists corrosion in outdoor, wet, and chemically active environments where standard carbon-steel anchors would degrade
• Familiar sizing for faster installs - the standard 1/2 in. ANSI fractional diameter means no specialty drill bits or sockets are needed; it installs with a 1/2 in. drill bit and a 3/4 in. wrench, keeping the workflow simple and efficient

Specifications

• Brand: Simpson Strong-Tie
• Diameter: 1/2 in.
• Length: 8-1/2 in.
• Thread Length: 6 in.
• Drill Bit Diameter: 1/2 in.
• Finish: Type 304 Stainless Steel
• Material: Type 304 Stainless Steel
• Anchor Body Material: Type 304 Stainless Steel
• Nut Material: Type 304 Stainless Steel
• Washer Material: Type 304 Stainless Steel
• Clip Material: Type 304 or Type 316 Stainless Steel
• Assembly: Fully Assembled
• Standards: Tested per ACI 355.2 and AC193
• Country of Origin: China

Available Pack Options

• STB2-508124SS-R: 4 Pk
• STB2-50812S4F20: 20 Pk
• STB2-50812S4F20 -2: 40 Pk

Install With

• Installs with 1/2 in. drill bit and 3/4 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. Dual undercutting embossments on each clip segment allow secondary expansion if a crack forms and intersects the anchor location, significantly increasing its ability to carry load even if the hole expands.

Is this anchor appropriate for seismic applications?

Yes. The Strong-Bolt 2 is qualified for static and seismic loading conditions covering seismic design categories A through F - the full range of seismic code classifications. It is also suitable for high-wind conditions, making it appropriate for structurally critical fastening in demanding environments.

What tools are needed to install this wedge anchor?

Installation requires a 1/2 in. drill bit and a 3/4 in. wrench. The anchor uses standard ANSI fractional sizing, so it works with common drill bits and tool sizes without the need for specialty equipment.

Can this anchor be used in overhead or horizontal orientations?

Yes. The Strong-Bolt 2 is suitable for horizontal, vertical, and overhead applications, giving installers flexibility across a wide range of concrete fastening scenarios without needing orientation-specific anchors.