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Simpson ABU44RZ Rough Cut 4x4 Adjustable Post Base - Zmax Finish

Simpson ABU44RZ Rough Cut 4x4 Adjustable Post Base - Zmax Finish

Regular price $26.37
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Ships Jun 24 when you order now
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Notice - This connector is designed for Rough Cut lumber NOT nominal lumber (most common). This will only fit a post that measures an actual 4x4". If you have a nominal post measuring 3-1/2x3-1/2" you will need an ABU44Z Post base

The Simpson ABU44RZ Rough Cut 4x4 Adjustable Post Base - Zmax Finish is designed to securely attach wood posts to existing concrete, making it an essential component for your construction projects. This versatile post base is ideal for various applications and the additional uplift support makes this a good choice for jobs where high capacity uplift is necessary. Its built-in 1-inch standoff design helps prevent rot at the end of the post, ensuring durability and longevity.

One of the standout features of the ABU Adjustable Post Base is its slotted anchor hole, which allows for precise post placement, making installation more manageable. The post base can be attached using nails or Strong-Drive® SD Connector screws, providing flexibility and ease of use.

This product is intended for use with Rough Cut 4x4 lumber but is also available in other sizes, including double 2x, 4x4, 4x6, and 6x6, for both nominal and rough-cut lumber.


  • Increased Load Capacity: Engineered to withstand higher uplift loads, making it ideal for areas prone to earthquakes or high winds.
  • Versatile Application: Intended for use with Rough Cut 4x4 lumber with a slotted base for adjustable installation.
  • Enhanced Durability: The 1-inch standoff design meets code requirements and helps prevent post rot.
  • Light Corrosion Resistance: Proprietary ZMAX coating applied to the product provides protection against corrosion in most environments.

California Residents: WARNING


Material: Steel
Post Size: Rough Cut 4x4
Fasteners required: - (12) 0.162 x 3-1/2" Nails OR - (2) 1/2" Bolts - (1) 5/8" Concrete Anchor
Finish: ZMAX
Manufacturer name: Simpson Strong-Tie
For Treated Lumber: Yes
Product Guide: View Spec Sheet


-The slot in the base enables flexible positioning around the anchor bolt, making precise post placement easier
-The 1" standoff helps prevent rot at the end of the post and meets code requirements for structural posts installed in basements or exposed to weather or water splash


-Use all specified fasteners.
-Post bases do not provide adequate resistance to prevent members from rotating about the base and therefore are not recommended for non top-supported installations (such as fences or unbraced carports).
-Place the base, load transfer plate and nut on the anchor bolt. Loosely tighten the nut.
-Place the standoff base and then the post in the ABU.
-Fasten using nails or Strong-Drive SD structural connector screws or bolts (ABU88, ABU1010 – SDS optional).

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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:

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