The Simpson ABA44RZ ABA ZMAX Galvanized Adjustable Standoff Post Base for Rough 4x4 is built by Simpson to securely attach wooden posts to existing concrete in demanding structural and exterior applications. A built-in 1-inch standoff keeps the post end elevated above the concrete surface to help prevent rot, while a slotted anchor hole allows on-site positioning flexibility around the anchor bolt. Constructed from 16-gauge steel with a ZMAX galvanized finish, this adjustable post base delivers a cost-effective, code-compliant connection for posts exposed to weather, water splash, seismic forces, or wind loading.

Key Features

• Slotted anchor hole for adjustability - the slot enables flexibility around the anchor bolt, making precise post placement easier during installation and reducing the need for rework.
• 1-inch standoff design - elevates the post end above the concrete surface to help prevent rot and meets code requirements for structural posts installed in basements or locations exposed to weather or water splash.
• Increased uplift load capacity - engineered to handle elevated uplift loads from earthquake or wind loading, making it suitable for seismic and high-wind applications.
• Sized specifically for rough cut 4x4 lumber - designed exclusively for rough nominal 4x4 posts, ensuring a proper fit without the guesswork associated with mixing rough and dimensional lumber sizes.
• 16-gauge steel construction - provides the structural strength needed for load-bearing post-to-concrete connections in both interior and exterior settings.
• ZMAX galvanized finish - offers extra corrosion resistance compared to standard galvanized coatings, making this post base well suited for exterior installations and use with treated lumber where moisture and chemicals can accelerate corrosion.
• Compatible with nails or Strong-Drive SD Connector screws - attaches to the post using either fastener type, giving installers flexibility based on the tools and hardware they have on hand.

Why This Product

• Built-in rot protection that meets code - the 1-inch standoff is not just a convenience feature; it actively helps protect the post end from moisture damage and satisfies code requirements for basement and weather-exposed structural post installations, reducing long-term maintenance concerns.
• Adjustability that saves time on the job - the slotted base hole lets you fine-tune post positioning relative to an existing anchor bolt rather than demanding perfect anchor placement upfront, which is especially valuable when working around already-set concrete.
• ZMAX coating for corrosive and treated-lumber environments - where standard galvanized hardware can corrode prematurely in contact with treated wood or outdoor moisture, the ZMAX finish provides an added layer of protection that extends the service life of the connection.
• Engineered for structural confidence in high-load conditions - with increased uplift resistance for earthquake and wind loading, this post base is a reliable choice for applications where code compliance and structural performance under lateral or uplift forces are non-negotiable.

Specifications

• Model Number: ABA44RZ
• Nominal Post Size: 4x4 rough
• Gauge: 16
• Width (in.): 4 1/16
• Height (in.): 2 13/16
• Length (in.): 3 1/8
• Coating/Finish: ZMAX
• Country of Origin: United States

Approved Applications

• Attaching wooden posts to existing concrete foundations
• Structural posts installed in basements
• Exterior post installations exposed to weather or water splash
• Applications requiring increased uplift resistance for earthquake or wind loading
• Installations involving treated lumber in exterior and corrosive environments

Frequently Asked Questions

What size post is the ABA44RZ designed for?

The ABA44RZ is designed exclusively for use with rough cut 4x4 nominal lumber. It is part of the "R" series of post bases, which are intended specifically for rough cut lumber dimensions rather than standard dimensional lumber.

Why does this post base have a 1-inch standoff?

The 1-in. standoff design helps prevent rot at the end of the post by keeping it elevated above the concrete surface. This standoff also meets code requirements for structural posts installed in basements or in locations exposed to weather or water splash.

What fasteners are required to install the ABA44RZ?

Installation requires either (6) #9 x 1-1/2 in. Strong-Drive SD Connector screws or (6) 0.148 in. x 3 in. nails to attach to the post, along with (1) 1/2 in. anchor bolt and (1) 1/2 in. washer to secure the base to the concrete.

What makes ZMAX galvanization different from standard galvanized coatings?

ZMAX galvanization offers extra corrosion resistance compared to standard galvanized finishes, making the ABA44RZ well suited for exterior applications and use with treated wood where exposure to moisture and corrosive conditions is a concern.

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