The Simpson ABA ZMAX Galvanized Adjustable Standoff Post Base for Double 2x4 is built by Simpson to securely connect double 2x4 wooden posts to existing concrete foundations in both interior and exterior structural applications. The built-in 1 in. standoff elevates the post end above the concrete surface to help prevent moisture-related rot, while the slotted anchor hole allows on-site positioning flexibility so installations go smoothly even when anchor bolt placement is not perfectly precise. Constructed from 16-gauge steel with a ZMAX galvanized finish, this adjustable post base delivers a cost-effective, code-compliant solution for decks, carports, pergolas, basement columns, and other structural post connections exposed to weather or water splash.

Key Features

• Slotted anchor hole - allows flexible positioning around the anchor bolt, so precise post placement is achievable even when bolt locations are slightly off-center
• Built-in 1 in. standoff - keeps the post end elevated above the concrete surface, meeting code requirements for structural posts in basements or areas exposed to weather or water splash, and helping prevent rot over time
• Increased uplift load capacity - engineered to handle the higher lateral and vertical forces associated with earthquake or wind loading, adding resilience to the overall structure
• 16-gauge steel construction - provides a sturdy, reliable connection between post and foundation without unnecessary bulk
• ZMAX galvanized finish - delivers extra corrosion resistance compared to standard galvanized coatings, making this post base well suited for exterior environments and use with pressure-treated lumber
• Nails or Strong-Drive SD Connector screw installation - accommodates the fastener type already on hand, giving installers straightforward attachment options to the post

Why This Product

• Built-in rot protection where it matters most - the 1 in. standoff design keeps wood off the concrete, directly addressing one of the most common causes of post failure in moisture-prone or below-grade installations
• Adjustability that saves time on the job - the slotted anchor hole means the base can shift around the anchor bolt during installation, reducing the costly rework that comes with rigid, fixed-hole designs when field conditions are less than perfect
• ZMAX coating for long-term durability - the heavy-duty zinc galvanization is specifically suited for exterior and treated-wood applications where standard connectors are more vulnerable to corrosive degradation, making this a dependable long-term investment
• Engineered for demanding load conditions - increased uplift capacity for earthquake or wind loading means this post base is appropriate for regions or applications where structural connectors must meet elevated performance requirements

Specifications

• Model Number: ABA24-2Z
• Member Size: Double 2x4
• Gauge: 16
• Width: 3-1/8 in.
• Length: 3-3/8 in.
• Height: 3-1/8 in.
• Coating: ZMAX
• Finish: ZMAX
• Country of Origin: United States
• Install With: (6) #9 x 2-1/2 in. Strong-Drive SD screws or (6) 0.148 in. x 3 in. nails AND (1) 1/2 in. anchor bolt with (1) 1/2 in. washer

Frequently Asked Questions

Why does the ABA24-2Z include a 1-inch standoff?

The 1-in. standoff design meets code requirements for structural posts installed in basements or exposed to weather or water splash. By keeping the end of the post elevated above the concrete surface, the standoff helps prevent moisture contact that can lead to rot over time.

What hardware is needed to install the ABA24-2Z?

Installation requires either (6) #9 x 2-1/2 in. Strong-Drive SD screws or (6) 0.148 in. x 3 in. nails to attach to the post, plus (1) 1/2 in. anchor bolt and (1) 1/2 in. washer to secure the base to the concrete. Fasteners are not included with the post base.

What is ZMAX galvanization and why does it matter?

ZMAX galvanization is a heavy-duty zinc coating applied to the steel that offers extra corrosion resistance compared to standard galvanized finishes. This makes the ABA24-2Z especially well suited for exterior applications and use with pressure-treated lumber, where standard connectors may be more susceptible to corrosive degradation.

Does the slotted anchor hole affect the strength of the post base?

The slot in the base is specifically designed to enable flexibility around the anchor bolt, making precise post placement easier without compromising the structural performance of the connector. The ABA24-2Z is also engineered to handle increased uplift loads associated with earthquake or wind loading conditions.

Note: Product dimensions may differ from picture. See item description for specifications.