Decking Post Anchors & Bases: what Claude and GPT would buy
Two AI models chose on their own, with no web access. Nobody tested these products: this is what each one says, and how to check it.
Claude and GPT choose the same brand, Simpson Strong-Tie, but not the same product
In Industrial & Scientific, Claude and GPT choose the same brand in 52 of 107 categories.
Claude Opus 5.5 · October 29, 2026
Simpson Strong-Tie ABU Adjustable Post Base ABU66Z
It is the default code-listed deck post base: ZMAX galvanized, raises the post end off the concrete, and allows positioning adjustment before the anchor bolt is tightened.
Not for: Builders using 4x4 posts, posts that must hide their connector, or saltwater-exposed decks that call for stainless hardware.
GPT 6.1 Sol · November 10, 2026
Simpson Strong-Tie ABA66Z
Adjustable positioning, a one-inch standoff, and ZMAX galvanization make it a practical base for nominal 6x6 deck posts.
Not for: Unbraced freestanding posts, direct burial, or posts other than nominal 6x6.
Which one fits you
4x4 posts
Simpson Strong-Tie ABU Adjustable Post Base ABU44Z
It is the same standoff base sized for 4x4 posts on light-duty structures and railings.
Not for: Load-bearing deck posts where your plans or local code call for 6x6.
decorative visible hardware
OZCO Ornamental Wood Ties (line)
It offers black, powder-coated post bases meant to be seen on pergolas and exposed decks.
Not for: Projects where an inspector expects a specific connector rated for the design load. Confirm the rating first.
Check before you buy
Specifications · 3 items
- Dimensions
- 5-1/2 x 5 x 6-1/16 in
- Anchor diameter
- 5/8 in
- Metal gauge
- 12 ga base, 10 ga strap
Taken from the pages of Walmart on November 11, 2026, not checked.
Where to find Simpson Strong-Tie ABU Adjustable Post Base ABU66Z
- The Home Depot
- Walmart
- DHC Supplies
Also seen on Amazon.
Shops seen in search results on November 11, 2026. A shop missing here may sell it too. Nothing was checked by a person.
Brands that matter
- Simpson Strong-Tie: Industry standard with the widest range of code-evaluated post bases.
- USP (MiTek): Main competitor with comparable structural post bases.
- OZCO: Decorative powder-coated hardware for visible installations.
What to avoid
- Electrogalvanized or painted-only bases used with pressure-treated lumber outdoors.
- Driven fence-post spikes as structural deck supports.
- Bases that let the post end sit flush on concrete.
- Mixing generic screws or nails into rated connectors.
Questions
Can I just set the deck post in the concrete instead?
Some codes allow embedded posts, but a standoff base on a footing keeps end grain dry and makes the post replaceable. Check your local requirements.
Do I need a separate post cap at the top?
Usually yes. The base handles the post-to-footing connection, and a post cap or beam connector is needed at the beam.