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ABA ZMAX Galvanized Adjustable Standoff Post Base for 4x4 Nominal Lumber

  • Adjustable post base for 4x4 designed for versatility
  • Great for use on patios and decks
  • Easy to install
  • See More Details

Frequently Bought Together


Product Overview

Deck Glamour Photo

Deck It Out

Strong decks bring beauty and entertaining space to your outdoor living area

Deck Glamour Photo

Make Your Deck Beautiful and Safe

Building a safe, strong deck starts with the proper connectors and fasteners

Photo of a deck being built

Deck Building Tips and Tricks

Installing corrosion-resistant connectors and fasteners helps extend the life of your deck

SDWH Screw being installed into ledger

Ledger connections critical for deck safety

Strong-Drive® SDWH Timber-Hex HDG screw delivers high-strength, wood-to-wood connectivity, such as deck ledger applications

DTT2Z guardrail install

Guardrail Installation Tips and Tricks

Don’t take chances with guardrail connections. DTT2Z deck tension ties fasten guardrails to deck framing.

DTT1Z install

Securing the Deck to the House

Install DTT1Z as a tension tie to meet building codes and eliminate the need to access to the floor joists inside the home

LSCZ install

Take the Step to Secure Deck Stairs

LSCZ adjustable stair-stringer connector offers a concealed connection between the stair stringer and the carrying header or rim board

Tight LUS26Z install shot

Joist Hangers

Provides bearing and uplift resistance

Tight H1 install shot

Hurricane Ties

Ideal for preventing lateral movement of joists

Tight SD screw install photo

SD Connector Screw

The only screw approved with Simpson Strong-Tie connectors

Tight install shot of LCEZ4

Post Caps

LCEZ end post caps provide a post-to-beam connection in new or retrofit deck applications

Tight PBSZ install photo

Post Base

Features a 1 in. standoff to resist wood decay

Stainless-steel connector product shot

Prevent Corrosion

Deck-Drive DWP stainless-steel fasteners are recommended for higher-exposure environments or applications

Post and Column Bases secure the bottom of posts or columns to concrete and are perfect for decks or patio covers. Models are available for attaching to existing hardened concrete, wet concrete, as well as wood. The post base for 4x4 also offers adjustability around the anchor bolt to achieve optimum post placement. And many models provide a 1 in. standoff from the concrete to help avoid post-end rot from moisture.
  • Attaches a post to existing concrete for decks, patio covers and other top-supported structures
  • Features 1 in. standoff to help prevent rot at post end
  • Slotted for adjustability
  • Designed for versatility, cost-effectiveness and maximum uplift performance
  • Nominal post size: 4 in. x 4 in.
  • Made from 16-Gauge steel
  • Z-MAX galvanization offers extra corrosion resistance for exterior and treated-wood applications
  • Install with 10d common nails or 9 x 1-1/2 in. strong-drive SD screws
  • Shop all Simpson Strong-Tie here.

Info & Guides

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Nominal Post Size (in.)
Product Depth (in.)
Product Height (in.)
Product Width (in.)


Base Type
Standoff Post Base
Connector Finish
G185 Galvanized
Fasteners Included
Fasteners Not Included
No Additional Features
Material Connector Compatibility
Wood to Concrete
Number of Pieces
Package Quantity
Product Weight (lb.)

Warranty / Certifications

Manufacturer Warranty
Limited Warranty

Questions & Answers


Will a sleeve fit if i use this to anchor a post

Asked by Hugo March 27, 2021

I am not sure if a sleeve will work. We used just the posts by themselves.

How perfectly flush does the 4x4 post have to sit in this post base? Can it be very slightly ang...

Asked by Michael March 3, 2021

For structural support, it’s always best to have it flush mounted. If you do need to “tilt your post some, determine the angle and cut the bottom of the 4x4 to match.

can this be used on the wooden deck for pergola

Asked by sourabh February 22, 2021

it can be used used to connect the deck with the post. I might suggest though using a more sturdier bracket like a ABU44. it has taller sides on two sides which aid in securing the post to the deck. it also has what we call a stand-off base which is really the bottom of the bracket has a 1" base that the post sits upon. the great thing about this is it sheds water away from the bottom of the post. this where many posts fail because the bottom of the post has no way of drying out sometimes.

Alignment of holes to attach base to post

Asked by Kplantern November 22, 2020


How are these adjusted

Asked by Gene November 11, 2020

for instance you've drilled the anchor bolt hole and now that the hole doesn't line up. well this bracket has a bolt hole that allows you to move the bracket and still anchor the bracket

Is it safe to use a 3/8 concrete anchor instead of 1/2? Im anchoring a post for my covered patio....

Asked by nunya October 27, 2020

You need to follow the manufactures speciation's, so that its safe and will pass code inspection. To answer your question on whether or not its safe will depend on the amount of wind sheer or up-drafts you have in your location. The bigger the anchor the less likely your covered patio will fail during a storm. Make sure you use a high quality concrete/ metal epoxy to help fix the anchor in the concrete, so it cant back out.

What are the actual dimensions of the anchor bolt slot? Why isn't that listed in the specificati...

Asked by Hausfrau September 22, 2020

depending upon the size of 4 x 4 ? that being place upon the bracket you could use a 1/2" bolt up to a 3/4" bolt.

Can these be used for fence post uprights?

Asked by Chris August 29, 2020

They are really meant to set on concrete slab to get the post off the wet slab when it rains so it doesn’t rot - like the posts on a front porch. That’s where I used them. If you use quick set concrete and brace the post while it sets you should not need these on a fence

How much weight can this support? If i used these under the sub platform for my hot tub (x9) conc...

Asked by JWerth August 4, 2020

J Werth, here is a load table published by the manufacturer. You can find a lot of information on the post bases at the manufacturers web siite https://www.strongtie.com/retrofitpostbases_postbases/aba-abu-abw_productgroup_wcc/p/aba.abu.abw

Are they ok to use in hurricane areas?

Asked by Nick August 3, 2020

this type of bracket may hold in a high wind but I'm sure they would fail in a hurricane

ABA ZMAX Galvanized Adjustable Standoff Post Base for 4x4 Nominal Lumber - page 2

Customer Reviews

  • 4.6
    out of 348 reviews
  • 90% recommend this product
Filter by:
Showing 1-10 of 348 reviews
Good post base
I intalled this post base onto a retaining wall. The top of the wall was filled with concrete so I used a Simpson Strong Tie to secure the post base into the concrete.
by Shirley
Nice product
Nice product
by Zarco217
Easy to install and looks like it will last forever .
Easy to install and looks like it will last forever .
by Joe
3 people found this helpful
I used this to create a shear point for our mailbox mounting post. The part mated up nice & squar...
I used this to create a shear point for our mailbox mounting post. The part mated up nice & square between the lower and upper post sections.
by EdEarl
2 people found this helpful
I like how Simpson has redesigned this product into one piece instead of the base plate being sep...
I like how Simpson has redesigned this product into one piece instead of the base plate being separate. It makes it easier to install.
by Tomcat
this product was used for a new pergola addition that is attached to the house. it served our pur...
this product was used for a new pergola addition that is attached to the house. it served our purposes great, the only downside was the pilot holes had to be redrilled in order to get the tapcon screws to go in all the way. There isn't enough clearance for the head of the drill if you use the holed provided. Once installed they were super solid and worked perfectly!
1 person found this helpful
A great post anchor when you can't 'go to ground'!
When you are trying to make a firm upright connection to a flat surface this is a great fix! It mounts to both surfaces securely and makes a stable post for your project.
Just what I needed.
I used two of these to anchor the stair rail posts at the base of stairs to a new deck I built. I also have angle ties anchoring the stair stringers to the concrete pad on the other side. By tying the posts to the post base and the stringers it made everything very sturdy.
by James
3 people found this helpful
Even tho the posts have other anchoring and are treated, I used these to elevate them from standing in the water.
by DD
1 person found this helpful
This product will help insure the integrity of this particular project
When I build or repair something the first thing that I require is functionally sound and aesthetically pleasing solutions. This particular bracket has both of these qualities and therefore passed the quality control test. Combined with the pressure treated lumber and deck screws this project is aesthetically pleasing and functionally sound. Our soon to be 15y old dog "Sandy" appreciates this ramp everyday.
by Boss
1 person found this helpful
Showing 1-10 of 348 reviews