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

$13.71 – $203.00

Aluglobus Heavy-Duty Aluminum Post

3″ × 3″ heavy-duty square aluminum post with a 12 ft length and .090″ wall
thickness. Manufactured from 6063-T6 aluminum for strong, corrosion-resistant
exterior support, with a clean black finish and matching flat press cap.

Post Size
3″ × 3″

Length
12 ft

Wall Thickness
.090″

Color
Black

Material
6063-T6 Aluminum

Classification
Heavy-Duty Square Post

Included
12 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 · 12 ft · HD .090 · Black

A 12 ft heavy-duty post for projects that need more length and more wall than the Light Duty family.

The 3×3 in. x 12 ft. HD Square Post (.090 Thk) – Black + Cap is specified as a 3-inch square aluminum support profile with a .090-inch heavy-duty wall and 12-foot supplied length. It is designed for projects where the lighter .080 LD post class is not the right structural direction, while still remaining distinct from Aluglobus’ heavier .120/.125-wall 3-inch HD post options.

Choose post & cap options ↑ View specifications ↓

12 ft supplied length

3″ square · 12 ft · .090 wall · HD class

Profile3″ × 3″

Length12 ft

Wall.090″

ClassHeavy Duty

Cap3″ aluminum cap

The .090 wall is the defining specification

This post steps above the .080 LD family without claiming the same wall as the heavier .120/.125 HD option.

Aluminum posts should be compared by both outside size and wall thickness. This SKU is specified at 3″ × 3″ with a .090 wall. That places it above the lighter .080 class while keeping it separate from the currently indexed 3″ × 3″ × 12 ft black HD post that Aluglobus publishes at roughly .120/.125 wall.

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.

Heavier option still existsWhen project loads demand more, Aluglobus also lists a 12 ft black 3″ post around the .120/.125-wall class. Do not treat the two posts as interchangeable.

.090″ wall
HD class

Conceptual cross-section · not to scale

Why 12 feet matters

Long stock gives more flexibility for tall fences, deeper approved support and changing grade.

A 12-foot extrusion is useful when standard 8-foot posts do not provide enough total length for the approved finished height and structural mounting. The extra stock can also simplify field cutting across projects with changing elevations.

Taller approved layouts

More stock length gives designers and installers room for taller fence conditions when the .090 HD class is appropriate.

More embedment flexibility

Longer material leaves more post available below grade when the project-specific footing design requires it.

Grade changes

Sloped and stepped properties often require different final cut lengths along one fence run.

Field-cut versatility

Starting with 12 ft allows the installer to cut down after finished elevations are confirmed instead of starting short.

Important: 12 ft is supplied stock length, not a universal finished fence height or footing depth. Structural mounting must still be sized from the actual project loads and site conditions.

Post + cap

Finish the 3-inch HD post with the matching 3-inch black aluminum cap.

Aluglobus’ current heavy-duty gate parts list includes a 3″ Aluminum Cap for true 3-inch square posts. Choose post and cap quantities from the actual fence or gate layout.

Structural profile

3″ × 3″ × 12 ft · .090 HD

Long square aluminum support profile specified with a .090-inch heavy-duty wall and black exterior finish.

Finishing accessory

3″ Aluminum Cap · Black

Matching top cap for true 3-inch square aluminum posts, closing the open extrusion and giving the support a finished appearance.

Do not order from post count alone: separate line posts, corners, ends and gate supports first. Some positions may require the heavier .120/.125 wall class or a different support system.

Choose product options ↑

Technical specifications

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

This page is built around the exact product specification supplied for the new grouped SKU: 3″ × 3″ profile, 12 ft supplied length, Heavy Duty classification, .090 wall and black finish.

Specification boundary: the exact live product wrapper is not yet exposed in the public index with a complete alloy/load table. The page therefore does not invent alloy, allowable load, wind rating, universal spacing or a fixed footing size.

Product: 3×3 in. x 12 ft. HD Square Post (.090 Thk) – Black + Cap
Cross section: 3″ × 3″ square
Supplied length: 12 ft
Wall thickness: .090″
Class: Heavy Duty
Material family: Aluminum square post
Finish: Black exterior finish
Matching cap: 3″ Aluminum 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
Heavier alternative: Separate 3″ × 12 ft black HD post around .120/.125 wall is currently listed by Aluglobus
Engineering: Confirm wind, load, spacing and footing requirements for the specific project

Three structural classes to understand

The post family is easier to specify when you separate length from wall class.

A longer post solves stock-length problems. A thicker wall solves structural-class problems. They are related, but they are not the same decision.

Decision point	3.15″ .080 LD	3″ .090 HD	3″ .120/.125 HD
Wall class	.080″ Light Duty	.090″ Heavy Duty	Heavier HD wall class
Outside size	3.15″ square	3″ square	3″ square
Role	Large-looking support where LD capacity is sufficient	Intermediate HD support with more wall than LD	Higher-demand gate and fence support
12 ft availability	11 ft is the longer LD stock in this family	12 ft exact SKU	12 ft black heavy-wall option is currently listed
Buying question	Is .080 enough?	Does .090 meet the design?	Do hinge loads, wind area or engineering require the heavier wall?

Applications

Where a 12 ft .090 HD post can make sense.

Use the HD post where the project benefits from additional wall thickness and long stock, but still verify the actual loads before assuming .090 is enough for every heavy condition.

Residential

Tall privacy fencing

Useful where approved tall fence layouts need more post length and a heavier wall class than the .080 LD family.

Perimeter

Large boundary systems

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

Grade

Sloped & stepped sites

Twelve-foot stock creates more field-cut flexibility where finished elevations change across the property.

Gate support

Compatible hinge conditions

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

Commercial

Higher-demand fence support

The .090 HD class is a step above LD where greater rigidity is needed but the heavier .120/.125 option is not required.

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

A 12 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 .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.

Aluglobus’ broader gate systems use architectural black powder coating, with AAMA 2604 listed on the current Universal DIY gate family. This individual post page does not assume that exact coating certification unless it is confirmed for the selected SKU.

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 · 12 ft · black · .090 HD wall

Installation planning

Twelve-foot posts need the footing, alignment and final elevation solved before installation.

Do not treat long stock as permission to guess at embedment. Establish the structural class, actual panel or gate loads, finished top line 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 is the correct wall class

Compare the actual loads against both the lighter .080 LD and heavier .120/.125 HD options before ordering.

Map every support role

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

Establish finished elevations

Use a laser, level or string line to determine how much of the 12-foot extrusion is actually needed at each location.

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 is one HD classThis SKU is specified as .090 HD, but Aluglobus also lists a heavier 12 ft black 3-inch post around .120/.125 wall.

Use the heavier post when requiredLarge automated gates, tall privacy leaves and high-wind openings may justify the heavier wall, reinforcement or project-specific engineering.

Frequently asked questions

Know what the 3″ × 3″ × 12 ft .090 HD post is before ordering it.

The important decisions are wall class, long-stock need, cap size and whether the actual fence or gate loads fit this profile.

What are the exact dimensions?

This SKU is specified as a 3-inch by 3-inch square post supplied in a 12-foot length.

What is the wall thickness?

The product name specifies a .090-inch wall and identifies the post as Heavy Duty.

Is this the same as Aluglobus’ .120/.125-wall 12 ft black post?

No. Aluglobus also has a separately listed 3-inch by 3-inch by 12-foot black HD post around the .120/.125-wall class. Treat the .090 and heavier-wall posts as different structural options.

What cap fits this post?

Use the matching 3-inch aluminum cap for true 3-inch square posts. Aluglobus currently lists a black 3-inch Aluminum Cap in its heavy-duty gate post options.

Is the finished fence automatically 12 feet high?

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

Can I use this post for a gate?

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

When should I choose the heavier .120/.125-wall post?

Use the heavier wall when gate leverage, privacy area, wind exposure, post spacing or engineering requirements exceed the verified capacity of the .090 post.

When is 12 ft stock useful?

Twelve-foot stock is useful for taller approved fence layouts, deeper project-specific support, changing grade and installations where final cut lengths vary.

Does the post 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 post is the black-finish version. If the project requires a specific AAMA coating level, powder manufacturer or gloss, confirm that exact finish specification for this SKU before submittal.

Factory-direct heavy-duty aluminum posts

Choose the wall class before the 12 ft post goes into the ground.

Select the 3″ × 3″ × 12 ft .090 HD black post and matching 3-inch cap from the product options, or send Aluglobus the fence or gate layout when you need help comparing .080 LD, .090 HD and the heavier .120/.125-wall HD family.

Choose product options ↑Request project support

Aluglobus Aluminum Systems · Heavy-duty aluminum posts · Fence systems · Gate systems · Nationwide supply

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22 July 2025

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