The Simpson Strong-Bolt 2 1/2 in. x 10 in. Wedge Anchor in Type 316 Stainless Steel is a wedge-type expansion anchor engineered for high-performance concrete fastening in the most demanding structural environments, including those subject to seismic and high-wind conditions. Dual undercutting embossments on each clip segment enable secondary expansion should a crack form and intersect the anchor location, significantly increasing the ability of the anchor to carry load if the hole expands. Fully assembled and manufactured entirely from Type 316 stainless steel, this concrete wedge anchor delivers long-lasting corrosion resistance across a wide variety of service environments - from interior structural applications to exposed or corrosive conditions.

Key Features

• Dual undercutting embossments on each clip segment - enable secondary expansion if a crack intersects the anchor location, maintaining load-carrying capacity even when concrete conditions change.
• Code listed for cracked and uncracked concrete applications - gives engineers and contractors the confidence of verified performance across a broad range of concrete conditions without requiring separate anchors for each scenario.
• Qualified for static and seismic loading conditions (seismic design categories A through F) - meets the most stringent structural requirements, making this anchor suitable for seismic zones across the full code spectrum.
• Chamfered top designed to prevent mushrooming during installation - protects the anchor threads and ensures clean, reliable installation without damaging the fastener head.
• Suitable for horizontal, vertical, and overhead applications - provides installation flexibility so one anchor solution covers multiple orientations on a single job site.
• Standard (ANSI) fractional sizes - fits standard fixtures and installs with common drill bit and tool sizes, reducing the need for specialized equipment and keeping installation straightforward.
• Tested per ACI355.2 and AC193 - independently verified performance standards give specifiers and inspectors documented assurance of anchor reliability.
• Made from Type 316 stainless steel throughout - anchor body, nut, washer, and clip are all Type 316 stainless steel, delivering consistent, long-lasting corrosion resistance in challenging service environments.

Why This Product

• Built for cracked concrete without compromise - most expansion anchors lose significant holding power when concrete cracks. The Strong-Bolt 2's dual undercutting embossments actively respond to crack formation with secondary expansion, so the anchor continues to carry load rather than simply accepting reduced performance.
• Full seismic and high-wind qualification from a single anchor - qualified for seismic design categories A through F and suitable for high-wind structural applications, this anchor eliminates the need to source different products for projects with elevated code requirements.
• All-Type-316 stainless steel construction for lasting durability - with every component - body, nut, washer, and clip - manufactured from Type 316 stainless steel, this anchor resists corrosion in environments where standard carbon steel or lower-grade stainless fasteners would deteriorate over time.
• Installs with standard tools and no learning curve - the 1/2 in. drill bit and 3/4 in. wrench requirement means crews can work with tools they already own, and the chamfered top and fully assembled design keep the installation process clean and efficient.

Specifications

• Size: 1/2 in. x 10 in.
• Manufacturer Part Number (MPN): STB2-50100S6F20
• Brand: Simpson Strong-Tie
• Anchor Type: Wedge-Type Expansion Anchor
• Diameter: 1/2 in.
• Length: 10 in.
• Thread Length: 6 in.
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• 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
• Assembly: Fully Assembled
• Installation Drill Bit Size: 1/2 in.
• Wrench Size: 3/4 in.
• Testing Standards: ACI355.2 and AC193
• Packaging: Packs of 20 and Cartons of 40

Approved Applications

• Cracked and uncracked concrete installations
• Static loading conditions
• Seismic loading conditions - seismic design categories A through F
• High-wind structural applications
• Horizontal anchor installations
• Vertical anchor installations
• Overhead anchor installations

Frequently Asked Questions

Is the Strong-Bolt 2 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 enable secondary expansion should a crack form and intersect the anchor location, significantly increasing the ability of the anchor to carry load if the hole expands.

What drill bit and tool sizes are needed to install this anchor?

The Strong-Bolt 2 1/2 in. x 10 in. wedge anchor installs with a 1/2 in. drill bit and requires a 3/4 in. wrench size for tightening.

Why is Type 316 stainless steel used for this anchor?

Type 316 stainless steel is specified for long-lasting corrosion resistance, making this anchor suitable for a wide variety of service environments where exposure to moisture or corrosive conditions is a concern. All components - including the anchor body, nut, washer, and clip - are constructed from Type 316 stainless steel.

Is the Strong-Bolt 2 qualified for seismic applications?

Yes. The Strong-Bolt 2 is qualified for both static and seismic loading conditions, covering seismic design categories A through F. It has been tested per ACI355.2 and AC193, making it an optimal choice for high-performance applications even in seismic and high-wind conditions.

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