The Simpson Strong-Tie ABU46Z ABU ZMAX Galvanized Adjustable Standoff Post Base is a high-capacity structural connector engineered to anchor 4x6 wooden posts to existing concrete with precision and long-term reliability. Built from 12-gauge steel with a ZMAX galvanized finish, this adjustable post base incorporates a built-in 1-in. standoff that keeps the post end elevated above the concrete surface, helping prevent moisture-related rot in basements, covered outdoor structures, and areas exposed to weather or water splash. A slotted anchor hole adds installation flexibility, while compatibility with nails, Strong-Drive SD Connector screws, or bolts makes it a versatile and cost-effective solution where maximum uplift performance is required.

Key Features

• Slotted anchor hole - provides flexibility around the anchor bolt so you can fine-tune post positioning even when bolt placement is not perfectly precise, reducing installation headaches in the field
• Built-in 1-in. standoff - elevates the post end above the concrete surface to help prevent rot and meets code requirements for structural posts in basements or locations exposed to weather and water splash
• Engineered for increased uplift loads - designed to resist the elevated forces produced by earthquake or wind loading, making it a sound choice for high-demand structural applications
• 12-gauge steel construction - delivers the strength and rigidity needed for high-capacity post-to-concrete connections without adding unnecessary bulk
• ZMAX galvanized finish - provides extra corrosion resistance beyond standard galvanization, making this post base well suited for exterior use and direct contact with treated lumber
• Multiple fastener options - accepts 0.162 in. x 3-1/2 in. nails, Strong-Drive SD Connector screws, or 1/2 in. machine bolts, giving installers the flexibility to work with the hardware that best suits the job

Why This Product

• Rot prevention built into the design - the 1-in. standoff keeps wood clear of the concrete surface, addressing one of the most common causes of post failure in moisture-prone or weather-exposed installations
• Adjustability that saves time on site - the slotted base hole accommodates minor anchor bolt offsets, so installers are not forced to re-drill or reposition anchors when field conditions are not ideal
• Corrosion resistance sized for tough environments - ZMAX galvanization is specifically suited for exterior settings and treated-wood contact, where standard coatings may break down prematurely due to moisture and chemical exposure
• Uplift performance for code-sensitive projects - the ABU46Z is designed to handle increased uplift loads from wind and seismic forces, making it a practical choice for regions with strict structural requirements

Specifications

• MPN: ABU46Z
• Brand: Simpson Strong-Tie
• Nominal Post Size: 4x6
• Width: 5 in.
• Length: 3-9/16 in.
• Height: 7 in.
• Hole Bottom: 2-5/8 in.
• Gauge: 12
• Coating / Finish: ZMAX
• Install With: 0.162 in. x 3-1/2 in. nails or 1/2 in. machine bolts (sold separately)
• Country of Origin: United States

Frequently Asked Questions

What is the purpose of the 1-in. standoff on the ABU46Z?

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

What fasteners are used to install the ABU46Z?

The ABU46Z can be installed using 0.162 in. x 3-1/2 in. nails or 1/2 in. 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 ABU46Z well-suited for exterior applications and use with treated wood, where standard galvanization may be insufficient to withstand moisture and chemical exposure over time.

How does the slotted anchor hole benefit installation?

The slot in the base provides flexibility around the anchor bolt, which allows for easier and more precise post placement even when anchor bolt positioning is not perfectly exact. This adjustability makes the ABU46Z a practical choice for field installation on existing concrete.

Note: Product dimensions may differ from picture.