The Simpson Strong-Bolt 2 Wedge Anchor in 3/8 in. x 2-1/4 in., Type 316 Stainless Steel is a wedge-type expansion anchor engineered for high-performance concrete anchoring in demanding structural, seismic, and high-wind applications. 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 Strong-Bolt 2 to carry load if the hole expands. The fully assembled Type 316 stainless-steel construction delivers long-lasting corrosion resistance across a wide variety of service environments, making this anchor a dependable choice wherever both structural integrity and material durability are required.

Key Features

• Code listed for cracked and uncracked concrete applications - gives installers the confidence to use a single anchor solution across a broad range of concrete conditions without needing to qualify separate products.
• Dual undercutting embossments on each clip segment - enable secondary expansion if a crack intersects the anchor location, helping the anchor maintain load-carrying capacity even when the concrete hole expands.
• Qualified for seismic design categories A through F under static and seismic loading conditions - meets the requirements for high-wind and seismic zone installations where code compliance is non-negotiable.
• Chamfered top designed to prevent mushrooming during installation - promotes cleaner, more consistent installation and reduces the risk of damage to the anchor head.
• Suitable for horizontal, vertical, and overhead applications - provides versatility across a full range of anchoring orientations, minimizing the need for application-specific hardware.
• Standard ANSI fractional sizing installs with a 3/8 in. drill bit and 9/16 in. wrench - fits common fixtures and works with everyday tools, reducing setup time and tooling costs on the job site.
• Tested per ACI355.2 and AC193 - independently verified performance standards give engineers and inspectors a documented basis for specification and approval.
• Made from Type 316 stainless steel throughout - anchor body, nut, washer, and clip - uniform material construction eliminates galvanic compatibility concerns and provides consistent corrosion resistance in harsh or moisture-exposed environments.

Why This Product

• Built for cracked concrete where other anchors fall short - the dual undercutting embossment design actively responds to crack formation by triggering secondary expansion, allowing the anchor to sustain loads in conditions that would compromise a standard wedge anchor.
• Full seismic and high-wind qualification from a single anchor - rated for seismic design categories A through F and approved for both static and seismic loading, this anchor simplifies specification for engineers working on code-regulated structures in demanding climates.
• All-316 stainless-steel construction for long-term reliability in corrosive environments - with every component - including the clip, nut, and washer - made from Type 316 stainless steel, this anchor is well suited for exterior, coastal, chemical-exposure, or high-moisture concrete anchoring applications.
• Straightforward installation with standard tools - ANSI fractional sizing, a chamfered top to prevent mushrooming, and compatibility with common drill bits and wrench sizes mean faster, more predictable installation with no specialty equipment required.

Specifications

• Model Number: STB2-37214S6F50
• Size: 3/8 in. x 2-1/4 in.
• Brand: Simpson Strong-Tie
• Anchor Type: Wedge-Type Expansion Anchor
• Diameter: 3/8 in.
• Length: 2-1/4 in.
• Thread Length: 1 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
• Required Drill Bit Size: 3/8 in.
• Required Wrench Size: 9/16 in.
• Test Standards: ACI355.2 and AC193
• Packaging: Packs of 50 and Cartons of 200

Approved Applications

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

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