The Simpson Strong-Bolt 2 5/8 in. x 6 in. Wedge Anchor in Type 304 Stainless Steel is a high-performance wedge-type expansion anchor engineered for concrete fastening in corrosive, high-wind, and seismic environments. Dual undercutting embossments on each clip segment enable secondary expansion should a crack form and intersect the anchor location, significantly increasing the anchor's ability to carry load if the hole expands - a critical advantage in cracked concrete applications. Built entirely from Type 304 stainless steel, this anchor delivers long-lasting corrosion resistance across a wide variety of demanding service environments.

Key Features

• Type 304 Stainless Steel construction - provides long-lasting corrosion resistance, making this anchor a reliable choice for exposed, wet, or chemically demanding environments where carbon steel fasteners would degrade
• Dual undercutting embossments on each clip segment - enable secondary expansion if a crack intersects the anchor location, preserving load-carrying capacity even as concrete conditions change over time
• Code listed for cracked and uncracked concrete applications - gives engineers and contractors confidence that the anchor meets recognized standards for both installation scenarios without requiring a separate product
• Qualified for seismic design categories A through F and static loading conditions - means this anchor is tested and approved for the full range of seismic zones, making it suitable for structurally critical installations in high-risk regions
• Chamfered top design - prevents mushrooming during installation, helping the anchor seat correctly and reducing the risk of installation errors
• Suitable for horizontal, vertical, and overhead applications - provides installation flexibility across a wide range of structural concrete fastening scenarios on any surface orientation
• Standard ANSI fractional sizing at 5/8 in. diameter - fits standard fixtures and installs with a common 5/8 in. drill bit and 15/16 in. wrench, reducing the need for specialty tooling on the job site
• Tested per ACI 355.2 and AC193 - independently verified performance gives project teams the documentation needed for code-compliant submittals and inspections

Why This Product

• Built for the most demanding structural conditions - qualified for seismic design categories A through F and high-wind applications, this anchor is engineered to perform where standard expansion anchors may not meet code requirements
• Exceptional protection in corrosive environments - full Type 304 stainless steel construction throughout the anchor body, nut, washer, and clip means no mixed-metal corrosion vulnerabilities, making it well suited for coastal, industrial, or high-moisture applications
• Secondary expansion technology adds a critical safety margin - the dual undercutting embossments allow the anchor to maintain load capacity even if the surrounding concrete cracks, offering a level of performance redundancy not found in standard wedge anchors
• Versatile installation compatibility - approved for cracked and uncracked concrete, and installable in horizontal, vertical, and overhead orientations using standard drill and wrench sizes, this anchor adapts to a broad range of project requirements without requiring specialized equipment or alternate products

Specifications

• Model No.: STB2-62600S4F20
• Size: 5/8 in. x 6 in.
• Coating/Material: Type 304 Stainless Steel
• Drill Bit Diameter: 5/8 in.
• Thread Length: 3-15/16 in.
• 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
• Packaging: Packs of 20 and Cartons of 80

Approved Applications

• Cracked concrete installations
• Uncracked concrete installations
• Seismic zone applications
• High-wind condition installations
• Corrosive and demanding service environments requiring stainless steel hardware

Frequently Asked Questions

Is the Strong-Bolt 2 STB2-62600S4F20 approved for use in cracked concrete?

Yes. 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 concrete installations.

What makes this anchor suitable for seismic and high-wind conditions?

The Strong-Bolt 2 is engineered as a high-performance wedge-type expansion anchor that is specifically listed for use in seismic and high-wind conditions, providing reliable load capacity where demanding structural performance is required.

How does the dual undercutting embossment feature work?

Each clip segment on the Strong-Bolt 2 features dual undercutting embossments that enable secondary expansion should a crack form and intersect the anchor location. This significantly increases the anchor's ability to carry load even if the hole expands over time.

Why is Type 304 Stainless Steel used for this anchor?

Type 304 Stainless Steel is used for the anchor body, nut, and washer because it provides long-lasting corrosion resistance suitable for a wide variety of service environments where standard carbon steel anchors may be susceptible to rust or degradation.

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