The Simpson ABA66RZ ABA ZMAX Galvanized Adjustable Standoff Post Base is built by Simpson to securely connect rough cut 6x6 wooden posts to existing concrete foundations. A built-in 1 in. standoff elevates the post end off the concrete surface to help prevent moisture-related rot, while a slotted anchor hole in the base allows for easy adjustability around the anchor bolt during installation. Whether you are securing structural posts in a basement, on a deck, or in any exterior environment exposed to weather or water splash, this adjustable post base offers a code-compliant, cost-effective solution with the heavy-duty corrosion resistance demanded by treated-wood and outdoor applications.

Key Features

• Slotted anchor hole for adjustability - enables flexibility around the anchor bolt so you can fine-tune post placement without fighting a fixed hole, saving time and reducing installation frustration
• Built-in 1 in. standoff - lifts the post end off the concrete surface to help prevent rot and meets code requirements for structural posts in basements or areas exposed to weather or water splash
• Increased uplift load capacity - engineered to handle elevated forces from earthquake or wind loading, giving you greater confidence in the structural integrity of the connection
• 14-gauge steel construction - provides the strength and rigidity needed for reliable post-to-foundation connections in demanding structural applications
• ZMAX galvanized coating - delivers extra corrosion resistance beyond standard galvanization, making this post base suitable for exterior environments and direct contact with pressure-treated lumber
• Compatible with 16d common nails or Strong-Drive SD connector screws - gives installers flexibility to use the fastener type that best suits their tools and jobsite conditions
• Designed exclusively for rough cut 6x6 lumber - the precise fit eliminates guesswork and ensures a properly engineered connection for rough-sawn post sizes

Why This Product

• Rot prevention built into the design - the 1 in. standoff keeps wood off the concrete, addressing one of the most common causes of long-term post failure in exterior and below-grade installations without requiring any additional hardware
• Adjustability that simplifies real-world installs - the slotted base accommodates minor anchor bolt positioning variations, reducing the need for corrections and making precise post placement achievable even when concrete work is not perfectly centered
• Corrosion resistance matched to tough environments - ZMAX galvanization is specifically suited for contact with treated wood and exposure to weather, making this post base a durable long-term choice for decks, pergolas, carports, and other outdoor structures
• Code-compliant performance for structural applications - the standoff design and increased uplift capacity make this base appropriate for code-required installations in basements and in regions where wind or seismic loading is a design consideration

Specifications

• Model Number: ABA66RZ
• Member Size: 6x6 rough
• Gauge: 14
• Width: 6 in.
• Height: 2-7/8 in.
• Length: 5-3/16 in.
• Coating/Finish: ZMAX
• Standoff: 1 in.
• Installation Fasteners: Install with 16d common nails or #10 x 1-1/2 Strong-Drive SD screws (sold separately)
• Required Fasteners: (1) 5/8 in. concrete anchor and (8) 0.162 in. x 3-1/2 in. nails
• Country of Origin: United States

Frequently Asked Questions

What size lumber is the ABA66RZ designed to fit?

The ABA66RZ is designed exclusively for use with rough cut 6x6 lumber. It is part of the "R" series of post bases, which are intended specifically for rough cut lumber rather than standard dimensional lumber.

What fasteners are required to install the ABA66RZ?

The ABA66RZ can be installed with 16d common nails or #10 x 1-1/2 Strong-Drive SD connector screws to attach the base to the post. Anchoring to concrete requires one 5/8 in. concrete anchor. When using nails, use (8) 0.162 in. x 3-1/2 in. nails as specified.

Why does the ABA66RZ include a 1-inch standoff?

The built-in 1-in. standoff elevates the bottom of the post off the concrete surface, helping to prevent moisture accumulation and rot at the post end. This standoff design also meets code requirements for structural posts installed in basements or in areas exposed to weather or water splash.

What makes the ZMAX coating suitable for exterior and treated-wood applications?

ZMAX galvanization provides a thicker zinc coating than standard galvanization, offering enhanced corrosion resistance. This makes the ABA66RZ well-suited for exterior installations and applications involving pressure-treated lumber, where exposure to moisture and corrosive preservatives is a concern.

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