The Simpson Strong-Bolt 2 1/2 in. x 10 in. Wedge Anchor in Type 304 Stainless Steel is a wedge-type expansion anchor built for high-performance structural anchoring in both cracked and uncracked concrete. Engineered by Simpson to meet the demands of seismic and high-wind conditions, this anchor features dual undercutting embossments on each clip segment that enable secondary expansion should a crack form and intersect the anchor location - significantly increasing load-carrying capacity if the hole expands. The Type 304 stainless steel construction delivers long-lasting corrosion resistance across a wide variety of service environments, making it a dependable choice for concrete fastening applications where both strength and durability are required.

Key Features

• Code listed for cracked and uncracked concrete applications - gives you the flexibility to use a single anchor solution across a broader range of structural conditions without second-guessing compliance.
• Dual undercutting embossments on each clip segment enable secondary expansion - if a crack intersects the anchor location, the anchor can continue to carry load, reducing the risk of connection failure in compromised concrete.
• Qualified for static and seismic loading conditions (seismic design categories A through F) - meets the most demanding code requirements for earthquake-prone and high-wind regions, so your installation stays code-compliant in virtually any U.S. location.
• Chamfered top designed to prevent mushrooming during installation - preserves thread integrity as you drive the anchor, making nut installation cleaner and reducing the chance of installation errors.
• Suitable for horizontal, vertical and overhead applications - one anchor handles multiple orientations, cutting down on the number of different fasteners you need to stock for a job.
• Standard (ANSI) fractional sizes - fits standard fixtures and installs with common drill bit and tool sizes, so no specialized equipment is required on site.
• Tested per ACI355.2 and AC193 - independently verified performance data backs every installation, supporting engineer approval and code documentation.
• Made from Type 304 stainless steel throughout - anchor body, nut, washer, and clip all share the same corrosion-resistant material, making this anchor well suited for damp, coastal, or chemically exposed environments.
• Installs with a 1/2 in. drill bit and 3/4 in. wrench size - straightforward tooling requirements mean faster setup and less downtime locating specialty tools.

Why This Product

• Built-in crack resistance adds a critical safety margin - the secondary expansion mechanism means the anchor does not simply lose holding power if concrete cracks at the anchor point, a key advantage for long-term structural reliability in seismic zones or aging concrete.
• Full Type 304 stainless steel construction throughout - with every component - including the nut and washer - made from corrosion-resistant stainless steel, this wedge anchor is a strong fit for outdoor, marine-adjacent, or moisture-heavy concrete anchoring applications where carbon steel hardware would degrade over time.
• Seismic design category A through F qualification - covers the full spectrum of U.S. seismic zones, making this concrete anchor a versatile specification for engineers and contractors working across multiple project types or geographic regions without needing to source separate products.
• Fully assembled and ready to install with common tools - arriving fully assembled and sized to standard ANSI fractional dimensions, this expansion anchor minimizes prep time on the job site and integrates easily with existing fixture layouts and drill equipment.

Specifications

• Size: 1/2 in. x 10 in.
• MPN: STB2-50100S4F20
• Brand: Simpson Strong-Tie
• Diameter: 1/2 in.
• Length: 10 in.
• Thread Length: 6 in.
• Material: Type 304 Stainless Steel
• Finish: 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
• Required Drill Bit Size: 1/2 in.
• Required Wrench Size: 3/4 in.
• Test Standards: ACI355.2 and AC193
• Packaging: Packs of 20 and Cartons of 40

Approved Applications

• Cracked concrete anchoring
• Uncracked concrete anchoring
• Seismic design categories A through F
• High-wind condition structural connections
• Horizontal installations
• Vertical installations
• Overhead installations
• Static and seismic loading conditions

Frequently Asked Questions

What type of concrete applications is the Strong-Bolt 2 rated for?

The Strong-Bolt 2 is code listed for both cracked and uncracked concrete applications, making it a versatile choice for a wide range of structural anchoring needs.

What makes the Strong-Bolt 2 suitable for seismic conditions?

The Strong-Bolt 2 is qualified for static and seismic loading conditions across seismic design categories A through F. Its dual undercutting embossments on each clip segment enable secondary expansion should a crack form and intersect the anchor location, significantly increasing its ability to carry load if the hole expands.

What tools are required to install the Strong-Bolt 2 1/2 in. x 10 in. wedge anchor?

Installation requires a 1/2 in. drill bit and a 3/4 in. wrench. Standard (ANSI) fractional sizing ensures compatibility with common drill bits and tool sizes.

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

Type 304 stainless steel provides long-lasting corrosion resistance, making the Strong-Bolt 2 well suited for a wide variety of service environments where moisture or corrosive conditions may be present.

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