The Simpson Strong-Bolt 2 Wedge Anchor in 3/8 in. x 2-3/4 in. is a high-performance, wedge-type expansion anchor engineered for demanding structural anchoring applications in both cracked and uncracked concrete. Manufactured by Simpson from Type 304 stainless steel, this anchor delivers lasting corrosion resistance across a wide range of service environments - making it a dependable choice for seismic zones, high-wind regions, and applications where long-term durability in corrosive conditions is critical.

Key Features

• Code listed for cracked and uncracked concrete applications - provides confidence and compliance across a broad range of structural anchoring situations
• Dual undercutting embossments on each clip segment enable secondary expansion if a crack intersects the anchor location - significantly increases load-carrying capacity even when the hole expands
• Qualified for static and seismic loading conditions (seismic design categories A through F) - suitable for earthquake-prone and high-wind regions without requiring a special-order alternative
• Chamfered top designed to prevent mushrooming during installation - results in cleaner, faster installation with fewer callbacks or damaged fasteners
• Suitable for horizontal, vertical, and overhead applications - offers installation flexibility that reduces the need to stock multiple anchor types for different orientations
• Standard ANSI fractional sizing at 3/8 in. - fits standard fixtures and installs with common drill bit and tool sizes already in your kit
• Tested per ACI355.2 and AC193 - independently validated performance data supports engineering approval and code compliance
• Made from Type 304 stainless steel - resists corrosion in wet, outdoor, and chemically challenging service environments for long service life

Why This Product

• Built for seismic and high-wind performance - the dual undercutting embossment design provides secondary expansion capability, making this anchor a reliable choice in seismic design categories A through F where standard anchors may not qualify
• Type 304 stainless steel construction means this anchor holds up in corrosive environments, coastal exposures, and wet service conditions where carbon steel fasteners would fail prematurely
• Cracked concrete listing removes guesswork - whether you are anchoring in new construction or existing concrete that may have settled or cracked, this anchor is code listed for both conditions
• Standard ANSI fractional sizes mean no specialty tooling is required - the 3/8 in. anchor installs with a 3/8 in. drill bit and a 9/16 in. wrench, tools that are already standard on most job sites

Specifications

• Brand: Simpson Strong-Tie
• Diameter: 3/8 in.
• Length: 2-3/4 in.
• Thread Length: 1 5/16 in.
• Drill Bit Diameter: 3/8 in.
• Material: Type 304 Stainless Steel
• Finish: Type 304 Stainless Steel

Available Pack Options

• STB2-372344SS: 50 Pk
• STB2-372344SS -5P: 250 Pk

Install With

• Installs with 3/8 in. drill bit and 9/16 in. wrench size

Frequently Asked Questions

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

Yes. The Strong-Bolt 2 wedge anchor 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, significantly increasing the anchor's ability to carry load even when the hole expands.

Is this anchor approved 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 also an optimal choice for high-wind conditions, and has been tested per ACI355.2 and AC193.

What installation tools are needed for this anchor?

This anchor installs with a 3/8 in. drill bit and a 9/16 in. wrench - both standard ANSI fractional sizes that are common on most job sites. No specialty tooling is required.

Why is Type 304 stainless steel used for this wedge anchor?

Type 304 stainless steel provides long-lasting corrosion resistance across a wide variety of service environments, including wet, outdoor, and chemically exposed conditions where standard carbon steel fasteners would be prone to rust and premature degradation.

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