The Simpson Rough 6 x 6 Adjustable Post Base ZMAX ABU66RZ is a Simpson Strong-Tie engineered standoff post base built to secure wooden posts to existing concrete in high-capacity structural applications. The built-in 1-inch standoff keeps the post end elevated above the concrete surface to help prevent rot, while ZMAX galvanization provides extra corrosion resistance for exterior installations and direct contact with treated wood. A slotted anchor hole gives installers room to fine-tune post positioning during anchor bolt placement, making this adjustable post base a practical, code-compliant solution designed for maximum uplift performance under earthquake or wind loading conditions.

Key Features

• Slotted anchor hole for adjustability - the slot in the base enables flexibility around the anchor bolt, making precise post placement easier and reducing the frustration of rigid, single-point anchor alignment on job sites.
• 1-inch standoff design - keeps the post end elevated off the concrete surface to help prevent moisture-related rot and meets code requirements for structural posts installed in basements or locations exposed to weather or water splash.
• Increased uplift load capacity - engineered for higher uplift performance under earthquake or wind loading, giving builders confidence in demanding structural and seismic applications.
• ZMAX galvanized coating - delivers extra corrosion resistance beyond standard galvanization, making this post base well-suited for exterior environments and installations where the connector contacts treated lumber.
• Multiple fastener options - compatible with 0.162 in. x 3-1/2 in. nails, Strong-Drive SD Connector screws, or 1/2 in. diameter machine bolts, giving installers flexibility to use the fastening method that best fits the application.
• Base 12 gauge / strap 10 gauge steel construction - heavier strap gauge where uplift loads are highest means the connector is built with material thickness matched to the demands of structural post connections.

Why This Product

• Built-in rot protection with code compliance - the 1-inch standoff is not just a convenience feature; it satisfies code requirements for posts in basements and weather-exposed locations, so builders and inspectors are on the same page from the start.
• Corrosion resistance suited for treated wood and outdoor use - ZMAX galvanization is specifically formulated to hold up where standard hardware corrodes prematurely, making this a reliable long-term choice for decks, pergolas, covered structures, and below-grade applications.
• Adjustability that saves time on the job - the slotted base works around real-world anchor bolt placement tolerances, reducing the need to cut and reset, which translates directly to faster, lower-stress installations.
• High-capacity uplift performance for structural reliability - designed to handle increased loads from wind and seismic events, this post base is a dependable choice when the structural connection between post and foundation cannot be left to chance.

Specifications

• MPN: ABU66RZ
• Brand: Simpson Strong-Tie
• Nominal Post Size: Rough 6x6
• Width: 5 in.
• Length: 6-1/16 in.
• Height: 5-13/16 in.
• Hole Bottom: 1-1/2 in.
• Coating: ZMAX
• Finish: ZMAX
• Gauge: Base 12; strap 10
• Install With: Install with 0.162 in. x 3-1/2 in. nails or 1/2 in. diameter machine bolts (sold separately)
• Country of Origin: United States

Frequently Asked Questions

What is the purpose of the 1-inch standoff on the ABU66RZ post base?

The built-in 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 used to install the Simpson ABU66RZ?

The ABU66RZ can be installed with 0.162 in. x 3-1/2 in. nails or 1/2 in. diameter machine bolts. It is also compatible with Strong-Drive SD Connector screws for attaching to the post.

Why is ZMAX galvanization important for this post base?

ZMAX galvanization provides extra corrosion resistance, making the ABU66RZ well-suited for exterior applications and installations where the hardware will be in contact with treated wood, which can be corrosive to standard galvanized hardware.

How does the slotted anchor hole benefit the installation process?

The slot in the base enables flexibility around the anchor bolt, allowing for adjustment during installation and making precise post placement easier when attaching wooden posts to existing concrete.

Note: Product dimensions may differ from picture.