Posts and accessories

3x3 in. x 12 ft. HD Square Post (.090 Thk) - Black

Heavy-duty 3x3 in. square aluminum post, 12 ft. long with a .090" wall and black finish. Made from 6063-T6 aluminum for pedestrian gates, sliding gates and fence installations that need a sturdy post.

Pedestrian Gates, Sliding Gates

$203.00

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Factory direct from Aluglobus Aluminum Systems
Nationwide shipping across the U.S.
Project support for homeowners and trade pros

4.9 ★100+ Google reviews

1,000+Active contractors nationwide

6063-T6Aluminum

Factory directSold as listed

Get the Highlights

Posts, slats and accessories that work as one system.

Black, white, bronze or woodgrain.

6063-T6 aluminum. It can't rust or rot.

AAMA 2604 powder coat over a 7-stage pretreatment.

Built for long, straight runs.

Factory direct, shipped nationwide.

3×3″ x 12 ft HD square postBlack coatedAluminumSold as listedShips nationwideExpert supportFactory direct3×3″ x 12 ft HD square postBlack coatedAluminumSold as listedShips nationwideExpert supportFactory direct

Product specs

3×3 in. x 12 ft. HD Square Post Specifications

This 3×3 in. x 12 ft. HD square post is made from 6063-T6 aluminum with a black coated finish, for residential and commercial fencing systems, gates and architectural installations.

3″ × 3″ square post profilePost cross-section with exact dimensions. Tap to enlarge.

Size3×3 in.

Length12 ft.

Wall thickness.090 in.

Material6063-T6 aluminum

FinishBlack coated

Install methodSet in concrete

aluminum fence post

Aluminum fence post: 3×3″ x 12 ft HD square post

Aluminum fence posts carry the slats, panels and gates of a horizontal fence. This 3×3 in. x 12 ft. HD square post is made from 6063-T6 aluminum with a black coated finish, for residential and commercial fencing systems, gates and architectural installations. Factory direct from Aluglobus in Southern California, shipped nationwide.

Where it's used

What you get, and where it goes.

Included: 1 post, 3×3 in. x 12 ft.
Fencing systems
Gates
Pergolas
Structural and architectural installations
Coastal environments

Square post and C-channel fence exploded drawing

How the square post system works

Square posts with C-channels hold the slats, finished with caps, spacers and base plates.

2″, 3″, 3.15″ and 4″ square posts
C-channel kits
Channel and C-channel spacers
Flat press caps
Base plates

Watch the videos

See the square post system

How square posts and channels hold the slats.

Real projects

Aluglobus fences, installed.

Real Aluglobus projects built with this system. Every photo is shown in full; tap to enlarge.

Inside the factory

See where your fence is actually made.

Inside the Aluglobus aluminum extrusion line, where the profiles for your fence are made. From there every piece goes through the 7-stage pretreatment line, the powder booths and the 110 ft cure oven. Factory direct, no middlemen.

6063-T6 USExtruded architectural aluminum

7 stagesArchitectural pretreatment before powder

110 ftCure oven, long enough for full-length profiles

NationwideFactory direct shipping to your site

Manufacturing warranty

No Factory Proof.
No Manufacturing Transparency.
No Warranty You Can Verify.

Know who manufactures your aluminum and who stands behind it.

U.S. company
U.S. warranty support

Powder coating warranty

No Coating Brand.
No Preparation Proof.
No Finish Warranty You Can Verify.

Know the coating manufacturer, the preparation process, and who's responsible for the finish.

Inside our U.S. machine shop

Engineered first. Manufactured in-house. Built with precision.

At Aluglobus, we don't just supply aluminum systems. We engineer and manufacture the components that make them work.

Inside our U.S. machine shop we make custom aluminum parts with CNC aluminum machining, precision laser cutting and aluminum sheet metal fabrication: engineered brackets and connection plates, specialized mounting hardware and custom components for our fences, gates and architectural aluminum systems. Making them ourselves gives us more control over quality, fit and customization.

U.S.-manufactured componentsEngineered aluminum brackets, connection plates and aluminum fence hardware, made in our own machine shop.

Precision machining of an aluminum bracket and connection plate in the Aluglobus U.S. machine shop — **Precision machining**Custom aluminum components machined for accurate system connections.

Precision laser cutting of aluminum sheet into mounting plates and brackets in the Aluglobus machine shop — **Laser-cut aluminum parts**Precision-cut brackets, mounting plates and fabricated components.

Laser cutter control station and live cutting camera in the Aluglobus U.S. machine shop — **Engineering and design**Technical design comes before precision manufacturing.

Laser-cut aluminum connection plates in the Aluglobus machine shop — **Custom components**Purpose-built aluminum brackets, connectors and mounting plates.

U.S.-based manufacturing facility

Our American machine shop manufactures aluminum components and custom parts for Aluglobus systems.

Engineered before manufacturing

Components start with technical design and engineering before they move into precision production.

Precision CNC machining

Custom aluminum parts are CNC-machined for consistent dimensions, accurate connections and dependable fit.

In-house laser cutting

Precision-cut aluminum sheets, mounting plates, brackets and specialized components.

Custom aluminum fabrication

Specialized brackets, connectors, mounting solutions and custom-designed parts made to your project requirements.

Quality control through direct manufacturing

More oversight of production for consistent components, accurate tolerances and reliable system compatibility.

Built for contractors and custom projects

Our fabrication supports aluminum fencing, gates, architectural applications and specialized installations.

A manufacturer behind the system

We show the process. So you know who stands behind the product.

Not just a supplier. From engineering drawings to finished aluminum components, we make the parts that make the system work.

Plan your fence

The right part for your fence.

Questions? Talk to a specialist
(888) 876-3006

Easy to install

Bolt-together aluminum with standard tools. No welding, no painting.

Ships nationwide

Factory-direct kits shipped across the U.S.

Real expert support

Homeowner and contractor support from the people who make it.

Trusted by thousands

4.9 stars on Google and 1,000+ active contractors nationwide.

Architectural quality

USA 6063-T6 aluminum and an AAMA 2604 powder-coat finish.

Built for any weather

No rust, no rot, non-combustible, with smoke developed 0.

Reviews

Real customers. Real reviews.

Homeowners and contractors on their Aluglobus fences and gates.

All reviews

DAYMOND JOHNCEO, Entrepreneur and Investor

MIKEHomeowner

DAVIDCustomer

4.9★★★★★Google rating, 100+ reviews

Installed Aluglobus fences

Read all reviews

Araceli U.

★★★★★

“Chris was amazing. He was very professional and guided us to get the perfect gates for our home. The installers were here when they said they would and worked diligently and efficiently.”

Valley One Gates & Access

★★★★★

“We use Aluglobus 100% with every fence/gate job we have. As a contractor I can say they are working very hard and their product is highest quality I can find and the best price.”

Contractor

Albert Torcaso

17 Sep 2025

“AluGlobus delivered a custom gate that is not only gorgeous but also highly functional. We love it!”

Google review

Jim Monahan

★★★★★

“AluGlobus was extremely helpful with my order, answering all my questions and delivering everything to Texas in perfect condition. The products were well-packed in a solid wood crate, and excellent quality.”

Shipped to Texas

Tiffany Salguero

28 Aug 2025

“I’m thrilled with the custom gate AluGlobus made for us. The team’s attention to detail was amazing.”

Google review

Cynthia Dalessandro

10 Sep 2025

“The AluGlobus team was fast, friendly, and professional. The gate looks beautiful, and we are very satisfied.”

Google review

Semra Sevim

8 Sep 2025

“AluGlobus was able to create a custom gate that matched our vision. The quality is outstanding!”

Google review

Michael Sharp

16 Sep 2025

“I’m beyond impressed with the custom gate AluGlobus made for us. They delivered exactly what we asked for.”

Google review

Wendy Van Den Berg

29 Aug 2025

“Very professional and efficient installation by AluGlobus Fence. Our new gate is sturdy and looks fantastic.”

Google review

Bonnie Paulson

9 Apr 2025

“AluGlobus Fence was a pleasure to work with. The installation was fast, and the gate looks fantastic.”

Google review

Patricia Williams

12 Sep 2025

“I highly recommend AluGlobus for your gate installation. The service was quick, and the results are excellent.”

Google review

Cecil Chavez

9 Apr 2025

“AluGlobus Fence exceeded my expectations with their high-quality gates and quick installation.”

Google review

See the system

Perfect aluminum fence installation technique

How it works

How to install it.

Plan the layoutPlan the layout and mark post locations according to the design.
Dig holesDig holes deep enough for the structure and local requirements.
Set and levelPosition the post and make sure it is level and properly aligned.
Pour concretePour concrete around the base and let it set fully.
Attach componentsAttach panels, gates or additional components.
Inspect and capConfirm alignment and finish the top with a post cap.

FAQ

Questions, answered.

What material is this post made from?

It is made from 6063-T6 aluminum, known for its strength, durability and corrosion resistance.

Is the black finish weather-resistant?

Yes, the coated finish is designed to withstand outdoor conditions without fading or peeling easily.

Does it require regular maintenance?

No, aluminum needs very little maintenance, just occasional cleaning.

Is it suitable for coastal environments?

Yes, aluminum is highly resistant to salt and moisture.

Can I install it myself?

Yes, with basic tools and proper preparation, though professional installation is recommended for larger projects.

Still not sure? Call (888) 876-3006 or send us your project.

FAQ

Buyer questions about the aluminum fence post.

Still not sure? Call (888) 876-3006 or send us your project.

Will this part fit my existing fence or gate?

It is made for Aluglobus systems. Send our team a photo and measurements and we will confirm the right part before you order.

What screws should I use with aluminum?

Use stainless steel fasteners with aluminum to avoid galvanic corrosion.

Full product description: 3×3 in. x 12 ft. HD Square Post (.090 Thk) – Black

3×3 in. x 12 ft. HD Square Post (.090 Thk) – Black

This 3×3 in. x 12 ft. HD square post is made from 6063-T6 aluminum with a black coated finish, for residential and commercial fencing systems, gates and architectural installations.

Specifications

Size: 3×3 in.
Length: 12 ft.
Wall thickness: .090 in.
Material: 6063-T6 aluminum
Finish: Black coated
Install method: Set in concrete

What you receive

1 post, 3×3 in. x 12 ft.

Where it is used

Fencing systems
Gates
Pergolas
Structural and architectural installations
Coastal environments

How to install

Plan the layout. Plan the layout and mark post locations according to the design.
Dig holes. Dig holes deep enough for the structure and local requirements.
Set and level. Position the post and make sure it is level and properly aligned.
Pour concrete. Pour concrete around the base and let it set fully.
Attach components. Attach panels, gates or additional components.
Inspect and cap. Confirm alignment and finish the top with a post cap.

Frequently asked questions

What material is this post made from?

It is made from 6063-T6 aluminum, known for its strength, durability and corrosion resistance.

Is the black finish weather-resistant?

Yes, the coated finish is designed to withstand outdoor conditions without fading or peeling easily.

Does it require regular maintenance?

No, aluminum needs very little maintenance, just occasional cleaning.

Is it suitable for coastal environments?

Yes, aluminum is highly resistant to salt and moisture.

Can I install it myself?

Yes, with basic tools and proper preparation, though professional installation is recommended for larger projects.

Need help choosing the right part? Call (888) 876-3006 or send us your project and an Aluglobus specialist will confirm it for you.

Locations

Showrooms, wholesale and partners near you.

See our systems in person at an Aluglobus showroom, pick up from a wholesale location, or work with an authorized partner. Nationwide U.S. shipping from the factory everywhere else.

ShowroomSouthern California16721 Roscoe Blvd, North Hills, CAGet directions ↗ShowroomNorthern California4909 Auburn Blvd #1, Sacramento, CA 95841Get directions ↗

WholesaleBay AreaSan Jose, CA · address upon request

WholesaleSacramento12355 Quicksilver Dr, Rancho Cordova, CA 95742Get directions ↗WholesaleFlorida5060 N.E. 12th Ave, Oakland Park, FL 33334Get directions ↗WholesaleHawaiʻi91-226 Kauhi St #2D, Kapolei, HI 96707 · OʻahuGet directions ↗

WholesaleIndio45080 Golf Center Parkway, Suite G, Indio, CA 92201

Authorized partnerCalabasas24000 Ventura Blvd, Calabasas, CAGet directions ↗Authorized partnerSan Diego9072 Clairemont Mesa Blvd, San Diego, CA 92123Get directions ↗

Authorized partnerColoradoContact us for partner details

Project supportLos AngelesOrange CountySan DiegoBay AreaSacramentoLancasterRancho CucamongaIndioNationwide shipping

Call (888) 876-3006 All contact options

Mon to Fri, 9:00 AM to 5:00 PM

Need help finding the right part?

Send your project details or a photo of the part you're replacing, and a specialist will match it for you.

Get a free quote Contractor pricing

Specifications

Technical details

Check sizes, material and configuration against your project before ordering.

With Screw Bush; AAMA 2604 Super-Durable Powder Coating; Powder Coated - Black; Aluminum 6063-T6
Usage: Pedestrian Gates, Sliding Gates

FAQ

Questions, answered

Still deciding?

Send your measurements and photos. Our team will help you choose the right system and parts.

Request a quote

What should I confirm before ordering?

Choose posts, caps and mounting accessories as a compatible set. Confirm dimensions and the mounting conditions before ordering.

Does the price cover everything shown?

Use the listed package details to confirm the supplied components. Installation photos and videos may show additional products.

How do I choose related components?

Match dimensions, profile and mounting conditions. Ask the team to check compatibility when a required connection or component is not specified.

Ready when you are

Ready to start your project?

Order online or send your project details for a factory-direct quote.

Choose options Request a quote

Trusted by investors, architects, homeowners and contractors

Watch Plug ✔

@watchplug

"I couldn't be happier with the fence. From the moment it went up, it completely transformed my backyard. The sleek design without visible posts gives it such a modern, high-end look. It's like having a piece of art around my home. I also love that it's fire-resistant, which gives me peace of mind living in this area. Definitely worth every penny!"

Mike

Home Owner

Daymond John

CEO, Entrepreneur & Investor

DW Design & Build ✔

@dannywangdesign

"We're honored to be recommended by Danny Wang Design, a premier contractor known for exceptional outdoor living spaces. In our latest collaboration, Danny created a stunning backyard and entrusted us with the gate and fence system. We're proud to be his trusted partner for quality and reliability."

"AluGlobus was extremely helpful with my order, answering all my questions and delivering everything to Texas in perfect condition. The products were well-packed in a solid wood crate, and excellent quality. I'm so glad I found them online. Highly recommended. I'll be buying from them again. Thanks to everyone who made it happen!"

David

Customer

Service Department

Mercedes Benz Engineer

"We use Aluglobus 100% with every fence/gate job we have. As a contractor I can say they are working very hard and their product is the highest quality I can find and the best price. We're very happy working with them! Our experience working with them is always top notch."

22 July 2025

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3x3 in. x 12 ft. HD Square Post (.090 Thk) - Black

Get the Highlights

3×3 in. x 12 ft. HD Square Post Specifications

Aluminum fence post: 3×3″ x 12 ft HD square post

What you get, and where it goes.

How the square post system works

See the square post system

Aluglobus fences, installed.

See where your fence is actually made.

No Factory Proof.No Manufacturing Transparency.No Warranty You Can Verify.

No Coating Brand.No Preparation Proof.No Finish Warranty You Can Verify.

Engineered first. Manufactured in-house. Built with precision.

We show the process. So you know who stands behind the product.

The right part for your fence.

Easy to install

Ships nationwide

Real expert support

Trusted by thousands

Architectural quality

Built for any weather

Real customers. Real reviews.

See the system

How to install it.

Questions, answered.

Buyer questions about the aluminum fence post.

3×3 in. x 12 ft. HD Square Post (.090 Thk) – Black

Specifications

What you receive

Where it is used

How to install

Frequently asked questions

What material is this post made from?

Is the black finish weather-resistant?

Does it require regular maintenance?

Is it suitable for coastal environments?

Can I install it myself?

Showrooms, wholesale and partners near you.

Need help finding the right part?

Technical details

Square post and C-channel fence system

Before you order

Questions, answered

Still deciding?

Ready to start your project?

Wholesale buyers get $150 OFF their order for a limited time.

FREE DIGITAL MAGAZINE

No Factory Proof.
No Manufacturing Transparency.
No Warranty You Can Verify.

No Coating Brand.
No Preparation Proof.
No Finish Warranty You Can Verify.