The Simpson Strong-Tie ABA66Z Adjustable Standoff Post Base is a retrofit post base for attaching a nominal 6x6 wood post to existing concrete. This is a post base designed for post-to-footing connections in decks and other top-supported structures. Model Number ABA66Z. If you are setting structural posts on cured concrete and want a cleaner, more forgiving installation than a fixed base, this is the hardware built for that job.

What makes the ABA66Z useful on the job is the slotted anchor hole in the base. Instead of having one locked-in anchor position, you get some adjustment around the anchor bolt, which makes precise post placement easier. That helps when you are lining up deck framing, patio cover posts, or other supports and need to correct small layout differences without reworking the footing.

The built-in 1 inch standoff is not just a nice detail. It helps meet code requirements for structural posts installed in basements or in areas exposed to weather or water splash, and it helps keep the end of the post off the concrete where moisture tends to sit. For exterior wood construction, that added separation is one of the features that actually matters long term.

On the strength side, the ABA66Z is made from 14 gauge steel with a ZMAX galvanized finish for extra corrosion resistance in exterior and treated-wood applications. Simpson rates this model for increased uplift loads for earthquake or wind loading, with allowable loads listed at 920 for uplift and 11,415 for download in the provided load table for Douglas Fir/Southern Pine conditions. It uses a 5/8 inch anchor diameter and fastens to the post with either (8) 0.162 x 3-1/2 inch nails or approved Strong-Drive SD connector screws.

In practical terms, this Simpson Strong-Tie post base is a strong fit for deck builders, remodelers, and contractors working on wood framing over existing concrete. It is best for decks, patio covers, and similar top-supported structures where you need a wood-to-concrete retrofit connection with some adjustability. It is not recommended for non-top-supported installations such as fences or unbraced carports, because post bases like this do not provide enough resistance to prevent the member from rotating about the base.

Simpson Strong-Tie ABA66Z Adjustable Standoff Post Base Gets the Important Stuff Right

If you are anchoring a 6x6 post to existing concrete, this is the kind of connector that makes layout easier and gives you the standoff you actually want outdoors.

• Who it's for: Deck builders, framers, and serious DIYers setting 6x6 posts on cured concrete for top-supported structures.
• Why it stands out: The slot gives you adjustment at the anchor bolt, and the 1 inch standoff helps with moisture management instead of trapping the post on the slab.
• Worth knowing: This is a retrofit post base, not a fix for unsupported post installations. Use the specified fasteners and keep it in the kind of application it was designed for.

• What size post does this base fit? The ABA66Z is sized for a nominal 6x6 wood post.
• Can this be used on existing concrete? Yes. The ABA series is designed to attach wood posts to existing concrete in retrofit applications.
• Does the base help keep the post away from standing moisture? Yes. It has a built-in 1 inch standoff that lifts the post off the concrete surface.
• What fasteners are used at the post? The provided load table lists (8) 0.162 x 3-1/2 inch nails, and Simpson also states the base can be fastened using nails or Strong-Drive SD connector screws.