The Simpson Strong-Bolt 2 5/8 in. x 4-1/2 in. Wedge Anchor in Type 316 Stainless Steel is a wedge-type expansion anchor built for high-performance structural connections in concrete where reliability under demanding conditions is non-negotiable. Engineered by Simpson to excel in seismic and high-wind environments, 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 even as base material conditions change. The fully assembled, all-316 stainless steel construction makes it a dependable solution for corrosion-prone service environments where long-term integrity matters.

Key Features

• Code listed for cracked and uncracked concrete applications - gives engineers and installers confidence that the anchor meets recognized standards for the widest range of concrete base material conditions.
• Dual undercutting embossments on each clip segment - allow secondary expansion if a crack intersects the anchor location, helping the anchor maintain load-carrying capacity when the concrete hole expands.
• Qualified for static and seismic loading conditions (seismic design categories A through F) - makes this anchor suitable for projects in virtually any seismic zone without requiring a separate, specialty product.
• Chamfered top designed to prevent mushrooming during installation - protects the thread and keeps installation clean, reducing the risk of installation errors on the job site.
• Suitable for horizontal, vertical, and overhead applications - offers installation flexibility so one anchor can address multiple orientations on a single project.
• Made from Type 316 Stainless Steel throughout - delivers long-lasting corrosion resistance across a wide variety of service environments, including those exposed to moisture or other corrosive conditions.
• Standard ANSI fractional sizing; installs with a 5/8 in. drill bit and 15/16 in. wrench - fits standard fixtures and works with common drill bits and hand tools already on the job site, keeping installation straightforward.
• Tested per ACI355.2 and AC193 - independently verified performance gives specifiers and inspectors documented assurance that the anchor meets established acceptance criteria.

Why This Product

• Built for seismic and high-wind structural demands - the Strong-Bolt 2 is qualified for seismic design categories A through F and tested for both static and seismic loading, making it one of the few wedge anchors suited to the most demanding code-required structural applications without substitution.
• Secondary expansion technology protects load capacity in cracked concrete - the dual undercutting embossments on each clip segment are a design-specific feature that actively responds if concrete cracks at the anchor location, maintaining the connection's ability to carry load rather than relying on the installer to anticipate every crack scenario.
• All-316 stainless steel assembly resists corrosion across challenging environments - because every component, including the anchor body, nut, washer, and clip, is Type 316 Stainless Steel, there are no mismatched materials that could corrode at different rates and compromise the connection over time.
• Drop-in compatibility with standard tools and fixtures - ANSI fractional sizing means this anchor integrates with existing hardware and installs using a standard 5/8 in. drill bit and 15/16 in. wrench, eliminating the need for specialty equipment or adapters on the job site.

Specifications

• Model Number: STB2-62412S6F20
• Coating/Material: Type 316 Stainless Steel
• Size: 5/8 in. x 4-1/2 in.
• Drill Bit Diameter: 5/8 in.
• Thread Length: 2-7/16 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
• Anchor Type: Wedge-Type Expansion Anchor
• Packaging: Packs of 20 and Cartons of 80

Approved Applications

• Cracked concrete installations
• Uncracked concrete installations
• Seismic condition applications
• High-wind condition applications
• Service environments requiring long-lasting corrosion resistance

Frequently Asked Questions

Is the Strong-Bolt 2 STB2-62412S6F20 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 allow secondary expansion if a crack forms and intersects the anchor location, helping maintain load-carrying capacity even as conditions change.

Why is Type 316 Stainless Steel used for all components of this anchor?

All components - including the anchor body, nut, washer, and clip - are made from Type 316 Stainless Steel to provide long-lasting corrosion resistance across a wide variety of service environments, particularly where exposure to moisture, chemicals, or other corrosive conditions is a concern.

What drill bit size is required to install the STB2-62412S6F20?

A 5/8 in. diameter drill bit is required for proper installation of this wedge anchor.

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

Yes. The Strong-Bolt 2 wedge-type expansion anchor is specifically recognized as an optimal choice for high-performance use in seismic and high-wind conditions, in addition to standard cracked and uncracked concrete applications.

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