3×3 in. x 8 ft. HD Square Post (.090 Thk) – Black + Cap

$13.71 – $135.00

Aluglobus Heavy-Duty Aluminum Post

3″ × 3″ heavy-duty square aluminum post with an 8 ft length and .090″ wall
thickness. Manufactured from 6063-T6 aluminum for strong, stable exterior
support, with a clean black finish and matching flat press cap.

Post Size
3″ × 3″

Length
8 ft

Wall Thickness
.090″

Color
Black

Material
6063-T6 Aluminum

Classification
Heavy-Duty Square Post

Included
8 ft Post + 3″ Flat Press Cap

Profile
Square Architectural Aluminum

Corrosion Resistance
Rust-Resistant Aluminum Construction

Application
Heavy-Duty Fence, Gate & Support Applications

Heavy-duty profile:
the .090″ wall provides increased rigidity for applications requiring
a stronger post. Confirm post depth, mounting method, loads, and
project-specific structural requirements before installation.

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SKU: 26571-1 Categories: Aluminum Fences - DIY Fence Kit Post, Posts Tags: price2024, shop

Description

Product Description

3″ Square Post · 8 ft · HD .090 · Black

A compact 8 ft heavy-duty post for projects that need the 3×3 .090 class without unnecessary extra stock.

The 3×3 in. x 8 ft. HD Square Post (.090 Thk) – Black + Cap groups a 3-inch square, 8-foot Heavy Duty aluminum post with a matching 3-inch flat press cap. The exact live SKU publishes a .090-inch wall and 6063-T6 aluminum, making it the practical shorter-stock option when the project needs the 3×3 HD class but does not require the extra length of the 12 ft sibling.

Choose post & cap options ↑ View specifications ↓

8 ft supplied length

6063-T6 · 3″ square · 8 ft · .090 HD

Profile3″ × 3″

Length8 ft

Wall.090″

ClassHeavy Duty

Grouped cap3″ Flat Press Cap · Black

The .090 wall is the defining specification

The .090 HD wall is the structural step. The 8 ft length is the efficiency step.

The live grouped product explicitly identifies a 3″ × 3″ square profile, 8 ft supplied length, .090 Heavy Duty wall and 6063-T6 aluminum. The 12 ft black sibling publishes the same .090 and 6063-T6 structural identity, so the length decision can be made separately from the wall-class decision.

3″ × 3″ footprintA substantial square post size that works visually with larger fence panels, privacy systems and gate openings.

.090″ HD wallMore wall material than the .080 Light Duty family, giving the post a higher structural class for compatible applications.

8 ft versus 12 ft is a stock-length choiceUse the 8 ft post when the approved finished height and mounting fit within the shorter extrusion. Move to the 12 ft .090 sibling when more stock length is required.

.090″ wall
HD class

Conceptual cross-section · not to scale

Why choose the 8 ft HD version

Use the shorter stock when the project needs HD support, not extra length.

The 8-foot post keeps the same published .090 Heavy Duty wall and 6063-T6 alloy as the exact 12 ft black sibling, but with less material to transport, stage and cut when the approved height and mounting fit within 8 feet.

Less excess stock

When 8 feet is enough, there is less unused material to buy and cut away compared with a 12 ft extrusion.

Easier handling

Shorter posts are simpler to transport and maneuver on many residential and light-commercial sites.

Same published HD identity

The exact 8 ft and 12 ft black siblings both publish a .090 wall and 6063-T6 aluminum.

Clear longer-stock option

Move to the 12 ft .090 HD sibling when deeper approved support, taller finished height or larger grade changes require more stock.

Important: 8 ft is supplied stock length, not a universal finished fence height or footing depth. Confirm the approved mounting and final elevation before ordering or cutting.

Grouped post + cap configuration

Select the 8 ft HD post and matching 3-inch flat press cap from the same product.

The exact grouped SKU contains two independently selectable quantities: the 3″ × 3″ × 8 ft HD Square Post (.090 Thk) – Black and the 3″ Flat Press Cap – Black.

Grouped structural profile

3″ × 3″ × 8 ft · .090 HD · 6063-T6

Heavy-duty square aluminum support profile with published .090-inch wall, verified 6063-T6 alloy and black finish.

Grouped finishing component

3″ Flat Press Cap · Black

Low-profile matching cap for the 3-inch square post family, selected separately inside the grouped product.

Quantity planning: post and cap quantities are independent. Count the structural post locations first, then add flat press caps only for exposed 3-inch post tops.

Choose grouped options ↑

Technical specifications

Use the exact SKU values, then keep engineering values project-specific.

The exact live grouped product confirms a 3″ × 3″ profile, 8 ft supplied length, .090 Heavy Duty wall, 6063-T6 aluminum, black finish and grouped 3″ Flat Press Cap – Black.

Specification boundary: wall thickness and alloy are verified on this grouped SKU, but allowable load, engineered wind rating, universal spacing and a fixed footing size are not published. Those values remain project-specific.

Product: 3×3 in. x 8 ft. HD Square Post (.090 Thk) – Black + Cap
Cross section: 3″ × 3″ square
Supplied length: 8 ft
Wall thickness: .090″
Class: Heavy Duty
Material: 6063-T6 aluminum square post
Finish: Black exterior finish
Grouped cap: 3″ Flat Press Cap · Black
Fence use: Compatible aluminum fence and privacy systems requiring a 3″ HD support
Gate use: Compatible gate-support conditions after hinge loads and foundation are verified
Longer sibling: 3″ × 3″ × 12 ft HD .090 Black + Cap, also published as 6063-T6
Engineering: Confirm wind, load, spacing and footing requirements for the specific project

Choose wall class first, stock length second

The 8 ft and 12 ft black HD siblings share the same published .090 / 6063-T6 identity.

That makes the choice easier. Use .090 HD when the support role calls for this structural class, then choose 8 ft or 12 ft based on approved finished height, mounting, embedment and grade.

Decision	3.15″ .080 LD family	3″ × 3″ × 8 ft .090 HD	3″ × 3″ × 12 ft .090 HD
Wall class	.080″ Light Duty	.090″ Heavy Duty	.090″ Heavy Duty
Alloy	Varies by exact SKU	6063-T6 published	6063-T6 published
Stock length	8 ft / 11 ft family options	8 ft	12 ft
Best reason to choose	LD support with larger 3.15″ footprint	HD support without unnecessary long stock	Same HD class when more total post length is required
Buying question	Is .080 LD enough?	Does the project fit within 8 ft?	Does the mounting or height actually require 12 ft?

Applications

Where an 8 ft .090 HD post can make sense.

Use the 8 ft HD post where the project benefits from the .090 wall class and the approved height and mounting fit within shorter stock. Verify the actual loads before assuming one HD profile is correct for every fence or gate condition.

Residential

HD privacy fencing

Useful where the design calls for a 3-inch .090 HD post and the approved height and mounting fit within 8 ft stock.

Perimeter

Large boundary systems

The 3-inch square profile provides a substantial support line for long residential and light-commercial perimeter runs.

Efficiency

Standard-height HD runs

Eight-foot stock avoids unnecessary cut-off where the approved fence height and mounting do not need the 12 ft sibling.

Gate support

Compatible hinge conditions

Use after leaf size, wind area, hinge geometry, automation and foundation are checked against the post class.

Commercial

Compact HD perimeter support

The .090 HD class provides a stronger structural direction than the .080 LD family while keeping the stock length practical for many perimeter conditions.

Coastal

Aluminum exterior support

Aluminum avoids iron-oxide rust and is a strong material direction for humid and salt-air fence environments when the finish and installation are properly maintained.

System context

The 8 ft HD post should be specified as part of the complete fence or gate system.

These Aluglobus system images illustrate the broader design context of posts, panels, gates and finish. They do not imply that every pictured project uses this exact 8 ft .090 SKU.

Aluglobus aluminum gate and fence system with structural support posts — Heavy-duty support should be selected from the complete gate or fence load path

Aluglobus aluminum fence installation and post alignment detail — Long posts make accurate alignment and footing layout more important

Aluglobus black powder coated aluminum finish detail — Factory-finished aluminum keeps the long support profile visually consistent

Profile size, wall thickness, cap and mounting belong in one specification

Black aluminum finish

The structural post should arrive finished and ready for exterior service.

The exact grouped SKU is the black version of the .090 HD 3-inch post and flat press cap. Aluglobus’ broader gate systems use architectural black powder coating, with AAMA 2604 listed on current Universal DIY gate families. Confirm the exact coating requirement if a project submittal depends on it.

Black architectural appearanceA consistent dark finish works naturally with modern privacy fences, slat systems and contemporary gate frames.

Aluminum substrateAluminum does not develop iron-oxide rust like steel, reducing a major maintenance concern in outdoor fencing.

Factory finish contextAluglobus’ current gate systems specify architectural powder coating and AAMA 2604 on applicable finished components.

Confirm the exact SKU coatingIf a project specification requires a particular AAMA level or powder manufacturer, verify that requirement before submittal.

3″ square · 8 ft · black · .090 HD · 6063-T6

Installation planning

Eight-foot posts need the finished height and mounting solved before installation.

Start with the verified .090 HD / 6063-T6 product class, then confirm that 8 ft is sufficient for the actual finished height and approved mounting before concrete or structural fasteners are finalized.

Before installation: verify that .090 HD is appropriate, then confirm post spacing, finished height, soil, wind exposure, gate loads, footing or base design and local requirements.

Confirm .090 HD is the correct class

Verify that the project needs the Heavy Duty .090 post rather than the lighter .080 LD family.

Map every support role

Separate line posts, corners, ends and hinge posts because one wall class may not be correct everywhere.

Confirm the 8 ft stock length

Use a laser, level or string line to confirm the above-grade height and available material for the approved mounting before cutting.

Design the structural mounting

Size concrete footings, bases or other supports from the real loads, soil and site conditions.

Set posts plumb in both directions

Long posts amplify small base errors, so verify vertical alignment before concrete or structural fasteners are finalized.

Sight the full run

Check the complete post line before installing fence panels or gate hardware.

Cut only after elevations are confirmed

Use suitable non-ferrous cutting equipment, protect the finish and deburr the final cut.

Install the 3-inch cap

Clean the finished post top and install the matching black aluminum cap after final cuts and alignment are complete.

Gate-support decision

HD does not mean every gate load is automatically covered.

Aluglobus’ current heavy-duty gate packages offer 3-inch black posts and matching 3-inch aluminum caps as optional gate-support components. For a gate, the correct post still depends on leaf width, weight, wind area, hinge geometry, automation and foundation design.

Fence load and hinge load are differentA stationary fence panel does not apply the same leverage and dynamic forces as a swinging or automated gate leaf.

.090 HD is verified on this exact SKUThe 8 ft grouped product publishes .090 wall and 6063-T6. Use those values as the product basis, then verify the actual hinge loads and foundation.

Use the 12 ft sibling when length is the issueIf the support class is correct but the project needs more stock for approved embedment or finished height, move to the 12 ft .090 HD sibling rather than changing wall class unnecessarily.

Frequently asked questions

Know exactly what the 3″ × 3″ × 8 ft .090 HD Black + Cap grouped product contains.

The exact SKU gives you verified .090 wall, verified 6063-T6 alloy, 8 ft stock and a matching flat press cap with independent quantity control.

What are the exact dimensions?

The exact grouped product lists a true 3-inch by 3-inch square post supplied in an 8-foot length.

What is the wall thickness?

The live grouped SKU publishes a .090-inch wall and identifies the post as Heavy Duty.

What aluminum alloy is used?

The exact 8 ft grouped product explicitly publishes 6063-T6.

What cap is grouped with the post?

The grouped selector includes a 3-inch Flat Press Cap in Black as a separate selectable quantity.

Are the post and cap quantities linked?

No. They are separate quantity fields within the grouped product. Order posts from the structural layout and caps from the number of exposed post tops.

When should I choose the 12 ft .090 HD sibling?

Choose the 12 ft sibling when the same .090 HD / 6063-T6 structural class is appropriate but the approved mounting, finished height or grade requires more total post length.

Is the finished fence automatically 8 feet high?

No. Eight feet is supplied stock length. Final above-grade height depends on mounting, embedment, grade and any field cut.

Can this post be used for a gate?

It can be considered for compatible gate-support conditions, but the correct hinge post still depends on leaf width, weight, wind area, hinges, automation and foundation design.

Does it have a universal footing depth?

No. Footing and embedment depend on fence height, panel area, wind exposure, soil, post spacing, gate loads and local structural requirements.

What coating specification should I use?

The grouped SKU is black. If a project requires a specific AAMA coating level, powder manufacturer, texture or gloss, confirm that finish requirement before submittal.

Factory-direct heavy-duty aluminum posts

Choose the HD wall class first, then choose the shortest stock length that correctly fits the project.

Select the 3″ × 3″ × 8 ft .090 HD 6063-T6 black post and matching 3-inch flat press cap from the grouped options, or send Aluglobus the layout when you need help deciding between 8 ft and 12 ft stock or confirming the support condition.

Choose product options ↑Request project support

Aluglobus Aluminum Systems · Grouped 8 ft HD black post + cap · Fence systems · Gate systems · Nationwide supply

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"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!"

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"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!"

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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 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

	3x3 in. x 8 ft. HD Square Post (.090 Thk) - Black$135.00	3x3 in. x 8 ft. HD Square Post (.090 Thk) - Black quantity
	3" Flat Press Cap - Black$13.71	3" Flat Press Cap - Black quantity

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3×3 in. x 8 ft. HD Square Post (.090 Thk) – Black + Cap