SKU: ABU44Z

Simpson ABU44Z 4x4 Adjustable Post Base - Zmax Finish

Simpson ABU44Z 4x4 Adjustable Post Base - Zmax Finish!

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$28.38
 
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Specifications

Finish: ZMAX
Material: Steel
Fasteners required: - (12) 0.162 x 3-1/2" Nails OR - (2) 1/2" Bolts - (1) 5/8" Concrete Anchor
For Treated Lumber: Yes
Manufacturer name: Simpson Strong-Tie
Post size: 4x4
Description

The Simpson ABU44Z 4x4 Adjustable Post Base is engineered for strength, durability, and ease of installation. Designed to anchor a nominal 4x4 wood post to concrete, it provides a strong connection while allowing for precise post placement during construction.

Made from 12-gauge steel and finished with Simpson’s ZMAX coating, this base offers superior corrosion resistance—ideal for outdoor applications where moisture is present. The base is slotted for adjustability, making it perfect for decks, patio covers, fences, and other wood-framed structures.

The unit includes a 1" standoff to help prevent post-end rot by keeping the wood elevated above moisture-prone surfaces. Pre-drilled holes simplify installation with anchoring hardware (sold separately).

Features:

  • ZMAX Finish: Provides heavy-duty corrosion resistance for outdoor and pressure-treated lumber use.
  • 1" Elevated Standoff: Helps reduce moisture contact, preventing rot at the base.
  • Slotted Base: Allows for precise post placement and alignment.
  • 12-Gauge Steel Construction: Ensures long-lasting structural strength.
  • Versatile Applications: Commonly used in decks, fences, and porch framing.
  • Easy Installation: Compatible with standard anchoring hardware (sold separately).

Installation Tip:
Secure the base to the concrete with a recommended anchor. Insert the post, align as needed, and fasten using approved Simpson Strong-Tie fasteners for a secure hold.

California Residents: WARNING

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× WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects and other reproductive harm. For more information visit: www.P65Warnings.ca.gov.

Customer Reviews

Based on 2 reviews
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R. Mark St. Laurent
DIY deck project by a homeowner

I used the ABU-44Z for the connection point for the ground contact stair rail post on a deck I am building. Prior to ordering the item I spoke with my local county building inspector/plans inspector and he confirmed that the ABU-44 was acceptable for this function in our county. The caveat was that I was required to use 1/2" diameter bolts driven through the sides of the ABU-44, each of the two surrounding stringers, and the 4x4 post.

The construction of the ABU-44 is solid and heavy duty. I am extremely pleased. But, I would expect nothing less for Simpson. The Simpson Strong Tie products perform as expected. It is nice to see a company taking pride and delivering quality products at at reasonable price. If you have questions call the Simpson 800 customer service number and a technician / product specialist will square you away and offer suggestions. I do not work for Simpson. I am a career fireman/medic.

I used 6" Simpson Strong Tie HD Titen screws to set the ABU-44z into the concrete base that has an overlay of 1" slate slab. The connection was a breeze and is solid. Can you say, "money!"

The connection with the 4x4 post via the 8" x 1/2" galvanized carriage bolts was simple. The connection without the stairs or railings is solid. When the stairs were completed with the treads and railing the assembly as a whole the connection is rock solid.

The inspector commented that that I "did it right".

The team at Fasteners Plus was phenomenal. I have ordered from them several times. Each time the items have arrived quickly withing 2-3 days of me placing the order. I highly recommend both The ABU-44 and Fasters Plus.

D
Doug Proctor
Great concrete to wood connection for decks.

I have gone to these almost exclusively when building decks. They keep my PT posts off the concrete, and with Fastenal's pricing they are competative with other solutions; assuming you have a good concrete drill.