The Simpson Strong-Bolt 2 Wedge Anchor, 5/8 in. x 7 in., Type 316 Stainless Steel is a wedge-type expansion anchor engineered for high-performance concrete fastening in the most demanding service environments. Built entirely from Type 316 stainless steel - anchor body, nut, washer, and clip - it delivers long-lasting corrosion resistance where exposure to moisture or corrosive elements is a concern. Dual undercutting embossments on each clip segment enable secondary expansion if a crack forms and intersects the anchor location, significantly increasing load-carrying capacity under those conditions. Whether the application calls for static loading, seismic conditions, or high-wind resistance, this anchor is code listed and tested to perform.

Key Features

• Type 316 stainless steel construction throughout (body, nut, washer, and clip) - provides long-lasting corrosion resistance across a wide variety of service environments where standard carbon steel anchors would degrade.
• 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 when the hole expands.
• Code listed for cracked and uncracked concrete applications - gives engineers and contractors a compliant, versatile fastening solution without needing separate products for different substrate conditions.
• Qualified for static and seismic loading conditions (seismic design categories A through F) - makes this anchor suitable for structural applications in high-wind and seismic zones without additional engineering workarounds.
• Chamfered top design - prevents mushrooming during installation, protecting threads and making final tightening more reliable and accurate.
• Suitable for horizontal, vertical, and overhead applications - provides installation flexibility across a broad range of concrete anchoring situations on the same job site.
• Standard ANSI fractional sizing and installs with a 5/8 in. drill bit and 15/16 in. wrench - fits standard fixtures and works with common tools, reducing setup time and the need for specialty equipment.
• Tested per ACI355.2 and AC193 - confirms the anchor meets recognized industry testing standards, supporting code compliance documentation and project approval.

Why This Product

• Built for environments where corrosion is a real concern - because every component is Type 316 stainless steel, this wedge anchor resists corrosion throughout its service life, making it a dependable choice for coastal, industrial, or high-moisture concrete fastening applications.
• Engineered to perform even after the concrete cracks - the dual undercutting embossments on each clip segment activate secondary expansion if a crack intersects the anchor, so the connection maintains load capacity under conditions that would compromise a standard expansion anchor.
• One anchor, multiple code-listed applications - qualified for seismic design categories A through F, static and seismic loading, and both cracked and uncracked concrete, this anchor reduces the need to source multiple products to cover different structural requirements on the same project.
• Straightforward installation with no specialty tooling - using a standard 5/8 in. drill bit and a 15/16 in. wrench, the Strong-Bolt 2 installs with common equipment and ANSI fractional sizing, keeping the workflow efficient whether anchoring structural supports, equipment, or framing connections to concrete.

Specifications

• Model Number: STB2-62700S6F20
• Coating/Material: Type 316 Stainless Steel
• Size: 5/8 in. x 7 in.
• Drill Bit Diameter: 5/8 in.
• Thread Length: 4-15/16 in.
• 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
• Packaging: Packs of 20 and Cartons of 80

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 if a crack forms and intersects the anchor location, significantly increasing the anchor's ability to carry load under those conditions.

Why is Type 316 stainless steel used for all components of this anchor?

Type 316 stainless steel is used for the anchor body, nut, washer, and clip because it offers long-lasting corrosion resistance, making it well suited for a wide variety of service environments where exposure to moisture or corrosive elements is a concern.

What drill bit size is required to install the STB2-62700S6F20?

Installation requires a 5/8 in. diameter drill bit, matching the anchor's diameter for a proper fit in the concrete substrate.

Can this anchor be used in seismic or high-wind applications?

Yes. The Strong-Bolt 2 is an optimal choice for high-performance applications even in seismic and high-wind conditions, and it is code listed to support these demanding structural requirements.

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