MaterialAluminum 6063-T6
FinishAAMA 2604 Super-Durable Powder Coating
ColorBlack
Size5x5 in.

Posts and accessories

5x5 in. Base Plate - Black

Metal fence post bracket: A 5x5 in. black aluminum base plate for 3x3 in. HD square posts, the base plate option for the 3x3 post in the pedestrian gate post options.

  • Aluminum 6063-T6
  • AAMA 2604 Super-Durable Powder Coating
  • Black
$35.00
Black base plate for 2.75 in. 2-way aluminum fence posts

$35.00

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  • Factory direct from Aluglobus Aluminum Systems
  • Nationwide shipping across the U.S.
  • Project support for homeowners and trade pros
MaterialAluminum 6063-T6
FinishAAMA 2604 Super-Durable Powder Coating
ColorBlack
Size5x5 in.
4.9 ā˜…100+ Google reviews
1,000+Active contractors nationwide
6063-T6Aluminum
Factory directSold as listed

Get the Highlights

ALU40 black fence along a lawn

Posts, slats and accessories that work as one system.

White T&G fence with black top rail

Black, white, bronze or woodgrain.

ALU40 woodgrain fence by a pool

AAMA 2604 powder coat over a 7-stage pretreatment.

Long T&G privacy fence

Built for long, straight runs.

ALU40 fence by a two-story house

Factory direct, shipped nationwide.

5Ɨ5″ base plate for 3Ɨ3 postBlack AAMA 2604 super-durable powder coatAluminumSold as listedShips nationwideExpert supportFactory direct5Ɨ5″ base plate for 3Ɨ3 postBlack AAMA 2604 super-durable powder coatAluminumSold as listedShips nationwideExpert supportFactory direct

Product specs

5Ɨ5 in. Base Plate for 3Ɨ3 Posts

The 5Ɨ5 in. Base Plate is a 3Ɨ3 aluminum post base plate, listed as the 5Ɨ5 in. Base Plate for 3Ɨ3 in. HD Post. It lets you surface-mount a 3Ɨ3 in. square post rather than setting it in a concrete footing.

Plate size5Ɨ5 in.
Fits post3Ɨ3 in. HD square post (.090 Thk)
MaterialAluminum 6063-T6
FinishBlack, AAMA 2604 super-durable powder coating
Install methodSurface mount to slab or wall
FastenersNot included
Suggested anchor3/8″ x 3-3/4″ wedge anchor (sold separately)

fence post base plate

Fence post base plate: 5Ɨ5″ base plate for 3Ɨ3 post

Base plates surface mount fence posts on concrete slabs and footings. The 5Ɨ5 in. Base Plate is a 3Ɨ3 aluminum post base plate, listed as the 5Ɨ5 in. Base Plate for 3Ɨ3 in. HD Post. It lets you surface-mount a 3Ɨ3 in. square post rather than setting it in a concrete footing. Factory direct from Aluglobus in Southern California, shipped nationwide.

Where it's used

What you get, and where it goes.

Wide backyard
  • Included: 1 base plate (anchors and screws not included)
  • Surface-mounting a 3Ɨ3 in. gate post
  • Mounting onto an existing slab or wall instead of digging a footing
  • Pedestrian gate post options
  • Gate kit posts
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.

T&G fence on square posts
ALU40 fence run
White T&G fence on a retaining wall
Side yard
Driveway run
Woodgrain fence
New build
Patio privacy

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.

TIGER CoatingsAkzoNobel

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 machiningCustom 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 partsPrecision-cut brackets, mounting plates and fabricated components.
Laser cutter control station and live cutting camera in the Aluglobus U.S. machine shop
Engineering and designTechnical design comes before precision manufacturing.
Laser-cut aluminum connection plates in the Aluglobus machine shop
Custom componentsPurpose-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 JohnDAYMOND JOHNCEO, Entrepreneur and Investor
MikeMIKEHomeowner
DavidDAVIDCustomer
4.9ā˜…ā˜…ā˜…ā˜…ā˜…Google rating, 100+ reviews
Installed Aluglobus fences
Installed Aluglobus fencesInstalled Aluglobus fencesInstalled Aluglobus fencesInstalled Aluglobus fencesInstalled Aluglobus fences
Read all reviews

Image outdoor

ā˜…ā˜…ā˜…ā˜…ā˜…

ā€œWorking with Aluglobos has been an absolute game-changer for my business. As a contractor, finding a reliable supplier who truly understands the importance of quality and customer service isn’t easy—but Ronni and Linna make it look effortless. […] The communication is always clear, the turnaround times are impressive, and they genuinely care about building long-term relationships with their clients.ā€

Google review Ā· Contractor

Marcus Navarro

ā˜…ā˜…ā˜…ā˜…ā˜…

ā€œI’ve been searching for a company that actually makes their material here in the U.S. and uses high-grade aluminum. […] Ronnie was great at explaining the difference in the aluminum they use, and I really liked being able to watch their YouTube videos too. They go really in-depth about the materials and the process which honestly helped me understand what I’m actually paying for.ā€

Google review

Jim Monahan

ā˜…ā˜…ā˜…ā˜…ā˜…

ā€œAluGlobus was very helpful in getting my order placed with all of my questions and needs, and I was extremely happy with the delivery to Texas. All product was carefully wrapped, protected and shipped in a solid wood crate. Pricing was very good and product quality excellent. […]ā€

Google review

Moshe Perez

ā˜…ā˜…ā˜…ā˜…ā˜…

ā€œI recently ordered an AluGlobus aluminum fence and gate kit for my property in Florida, and I couldn’t be happier with the experience. The shipping was fast and well-packaged, with everything arriving in perfect condition.ā€

Google review

Valley One Gates & Access

ā˜…ā˜…ā˜…ā˜…ā˜…

ā€œWe 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 ans the best price. We’re very happy working with them ! Our experience working with them is always top notch.ā€

Google review Ā· Contractor

Navid Kohan

ā˜…ā˜…ā˜…ā˜…ā˜…

ā€œI’m a General Contractor I can say from quality to price to the service they give absolutely the spot for contractors. The Aluminum gate is heavy duty at the Contractor line won’t disappoint and Fencing that goes with super easy to install but super heavy duty as well Love it and will definitely see them on my next fence gate projectsā€

Google review Ā· General contractor

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Araceli U.

ā˜…ā˜…ā˜…ā˜…ā˜…

ā€œChris 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.ā€

Tiffany Salguero

28 Aug 2025

ā€œI’m thrilled with the custom gate AluGlobus made for us. The team’s attention to detail was amazing.ā€

Google review

Cynthia Dalessandro

10 Sep 2025

ā€œThe AluGlobus team was fast, friendly, and professional. The gate looks beautiful, and we are very satisfied.ā€

Google review

Semra Sevim

8 Sep 2025

ā€œAluGlobus was able to create a custom gate that matched our vision. The quality is outstanding!ā€

Customer review

Michael Sharp

16 Sep 2025

ā€œI’m beyond impressed with the custom gate AluGlobus made for us. They delivered exactly what we asked for.ā€

Google review

Wendy Van Den Berg

29 Aug 2025

ā€œVery professional and efficient installation by AluGlobus Fence. Our new gate is sturdy and looks fantastic.ā€

Google review

Bonnie Paulson

9 Apr 2025

ā€œAluGlobus Fence was a pleasure to work with. The installation was fast, and the gate looks fantastic.ā€

Google review

Patricia Williams

12 Sep 2025

ā€œI highly recommend AluGlobus for your gate installation. The service was quick, and the results are excellent.ā€

Google review

Cecil Chavez

9 Apr 2025

ā€œAluGlobus Fence exceeded my expectations with their high-quality gates and quick installation.ā€

Google review

Read all 100+ reviews on Google →

See the system

Perfect aluminum fence installation technique
Perfect aluminum fence installation technique
Factory-direct aluminum fence and gate
Factory-direct aluminum fence and gate
Full front yard transformation
Full front yard transformation

FAQ

Questions, answered.

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

Which posts does it fit?

3Ɨ3 in. square posts (.090 Thk): the 6 ft., 8 ft. HD and 12 ft. HD lengths.

Are anchors included?

No anchors or screws are listed with the base plate. The 3/8″ x 3-3/4″ wedge anchor is offered for fence base plates to concrete.

How many do I need?

One plate per surface-mounted post; a single-swing gate typically needs a hinge post and a latch post.

Should I use a base plate or a footing for a gate?

Gate posts carry more load than line posts, so check your gate width, mounting surface and local code. Our team can help you choose.

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: 5Ɨ5 in. Base Plate – Black

A 5Ɨ5 in. 3Ɨ3 aluminum post base plate

The 5Ɨ5 in. Base Plate from Aluglobus Aluminum Systems is a 3Ɨ3 aluminum post base plate, made for the 3Ɨ3 in. HD post. It lets you surface-mount a 3Ɨ3 in. square post rather than setting it in a concrete footing. Like the posts it supports, it is 6063-T6 aluminum finished in black AAMA 2604 super-durable powder coating.

Where it fits in a gate project

In the pedestrian gate post options, the 3Ɨ3 in. Heavy-Duty Square Post (.090 Thk) with screw bush is listed for concrete footing or base plate, and this 5Ɨ5 in. plate is listed right beside it as the base plate option. The same post and plate are used in our gate kits, so this is the standard base for a 3Ɨ3 in. gate post. The sliding gate kits also list a 3 in. square post for concrete footing or wall. Use the plate where you are mounting onto an existing slab or wall rather than digging a footing.

Matching 3Ɨ3 posts

All three are listed with screw bush, in Black, for pedestrian and sliding gates. Finish the top with a matching flat press cap. Order one plate per surface-mounted post; a single-swing gate typically needs a hinge post and a latch post, so check your layout.

Fasteners

No anchors or screws are listed with the base plate. Use the 3/8″ x 3-3/4″ wedge anchor to fix fence base plates to concrete, and #14Ɨ2″ stainless steel screws to fasten the 3Ɨ3 HD post. Choose anchors that suit your surface and confirm the full set with our team.

Before you order

Gate posts carry more load than line posts, so check your gate width, the mounting surface and your local code before choosing surface mounting over a footing. If you are unsure whether a base plate suits your gate, send our team the gate size and site details and we will help you pick the post and base.

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.

Project supportLos AngelesOrange CountySan DiegoBay AreaSacramentoLancasterRancho CucamongaIndioNationwide shipping
Call (888) 876-3006All 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.

Watch

See it built and installed

Installation, product and factory videos from Aluglobus Aluminum Systems.

Specifications

Technical details

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

Size
5x5 in.
Fits
3x3 in. HD Square Post
Material
Aluminum 6063-T6
Finish
AAMA 2604 Super-Durable Powder Coating
Color
Black
Usage
3x3 in. Square Post Base Plate
Anchors
not included
Product views & drawings168 images

FAQ

Questions, answered

Still deciding?

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

Request a quote
Which post does the 5x5 in. base plate fit?

It is listed as the 5x5 in. Base Plate for 3x3 in. HD Post, with the usage 3x3 in. Square Post Base Plate.

Which 3x3 posts can I use with it?

We offer 3x3 in. square posts (.090 Thk) with screw bush in 6 ft., 8 ft. and 12 ft. lengths. In the pedestrian gate post options, the 3x3 post is listed for concrete footing or base plate.

Are anchors included?

No fasteners are listed with the plate. Use the 3/8" x 3-3/4" Wedge Anchor for fence base plates to concrete and #14x2" stainless steel screws for the 3x3 HD post; confirm the set with our team.

Does it fit a 4x4 post?

No. It is listed for 3x3 in. posts. The 4x4 in. HD posts are listed for concrete footing.

Is this a good fence post base?

Yes. It is part of the Aluglobus aluminum fence and gate system, so it matches our posts, slats and rails. Check the size and length listed above against your layout.

What else do people call this?

Shoppers also search for it as fence post base plate, heavy-duty post base or fence post bases.

Ready when you are

Ready to start your project?

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

Get Wholesale Pricing

Contractor or dealer pricing, or our full e-catalog. Tell us what you need and our wholesale team will get back to you.

10% off Premium Aluminum Woodgrain Collection

Limited Promotional Inventory

CONTRACTORS ONLY

Claim Your 10% Off

Send us your information and our team will help you check available woodgrain colors, profiles and current promotional inventory.

Valid on qualifying projects only. Minimum project value required. Restrictions may apply.

Aluglobus Aluminum Systems (White)

Get a free quote for your project.

Factory-direct aluminum fences, gates, patio covers and cladding. Send your sizes or a short description and our team will get back to you with pricing.

No obligation. Real people, real factory pricing.

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