The Simpson Strong-Tie APB66 adjustable post base is a decorative steel post base designed to secure a nominal 6x6 wood post or column to concrete in outdoor builds. This is a post base designed for wood-to-concrete post anchoring. Model Number: APB66. If you are building a pergola, patio cover, deck post connection, or another top-supported structure and want a cleaner finished look than a standard utility base, this hardware is built for that job.

What makes this base matter is how it solves a few real install problems at once. The slotted design gives you adjustment room when setting the post, which helps when field conditions are not perfect. The base also includes a 1 inch standoff that lifts the post off the concrete. That gap is important because it helps limit direct moisture contact at the post end, which can reduce the chance of rot over time in exterior applications.

For strength and code-driven applications, Simpson rates this series for projects that need to meet stringent building code requirements for seismic or high-wind events. That does not mean every job is the same, but it does tell you this is not just decorative trim hardware. It is structural connector hardware that also happens to look better than most standard bases. The fastener holes are slightly offset as well, which helps reduce fastener interference during installation.

The APB66 is part of the Outdoor Accents Mission Collection, so it is aimed at builders who want a more finished exposed-hardware look on the job. The black powder-coated appearance gives you the visual style people want on pergolas and outdoor living structures, while the ZMAX coating with black powder coat adds corrosion resistance for exterior and treated-wood use. In plain terms, it is made to be seen, not hidden.

Size-wise, this APB66 version is built for a nominal 6x6 post. Simpson lists it with a 12-gauge steel body, a width of 5-1/2 inches, a length of 5 inches, and a height of 7-1/2 inches. Those numbers matter because they tell you this base is sized specifically around nominal 6x6 material, not rough lumber. If you are using rough 6x6 stock, Simpson offers a separate APB66R version instead.

Installation hardware matters here. The Outdoor Accents connector system is intended to be used with the STN22 hex-head washer and SDWS22312DBB structural wood screw, which are sold separately. That combination gives the connection its intended structural and visual result. Outdoor Accents side plates are also available under APBDSP if your build calls for matching hardware details across the structure.

One practical note worth knowing before you buy: this type of post base is intended for top-supported structures. Simpson specifically notes these bases are not recommended for installations that lack top support, such as fences or unbraced carports, because they do not provide enough resistance to prevent members from rotating at the base. That is the kind of detail that saves you from using the right hardware in the wrong application.

Who should buy it? This is a good fit for deck builders, pergola installers, remodelers, and serious DIYers who want a cleaner exposed connection at the bottom of a 6x6 post without giving up structural intent. If you are building an outdoor structure where appearance matters and you still need a real post-to-footing connector, the APB66 is the right kind of hardware for the job.

Simpson Strong-Tie APB66 Adjustable Post Base for Better-Looking Outdoor Builds

The Simpson Strong-Tie APB66 adjustable post base is the one you buy when the post connection needs to do real work and still look like you planned it that way.

• Who it's for: Builders and serious DIYers putting up 6x6 pergolas, patio covers, and other top-supported outdoor structures on concrete.
• Why it stands out: You get structural intent, a 1 inch standoff to help with moisture, adjustability during install, and a finish that actually belongs on exposed outdoor framing.
• Worth knowing: This is not a complete hardware kit. You need the specified Outdoor Accents screws and washers, and it is not meant for unsupported posts like fences.

• What size post does the APB66 fit? It is designed for nominal 6x6 lumber.
• Can this post base be used outdoors? Yes. It is intended for exterior applications and uses ZMAX coating with a black powder coat for added corrosion resistance.
• Does the base provide spacing above the concrete? Yes. It includes a 1 inch standoff to help reduce moisture contact at the post end.
• Is this a good choice for a fence post or other unsupported post? No. Simpson notes these post bases are not recommended for installations lacking top support because they do not provide enough resistance to prevent rotation at the base.