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Don't Forget the Post Adapter Plate when Upgrading Your Mailbox☑️ The Stuff We Use

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Architectural Mailboxes 7540B-10 4x4 Adapter Plate Accessory, 4" x 4", Black

Visit the ARCHITECTURAL MAILBOXES Store

4.6 2,238 ratings

Material	Metal
Color	Black
Included Security Features	Hopper & Baffle
Brand	ARCHITECTURAL MAILBOXES
Mounting Type	Post Mount

About this item

Can be used to attach Architectural Mailboxes post mount Mailbox to a wooden 4x4 post
Multiple bolt hole patterns, including 4x10 bolt hole pattern and 11-1/4″ side flange mount screw pattern
Can be installed onto a wooden post as a top mount, side rail mount and front cantilever mount to suit your needs
Durable galvanized steel construction
Includes mailbox mounting hardware and spacers used for T2 sized mailbox installation.Finished with durable black powder coat.Supports up to a 50 lbs. mailbox

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Customer ratings by feature

Sturdiness

4.5

Value for money

4.3

Easy to install

4.3

See all reviews

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From the manufacturer

4x4 adapter plate

4 in. x 4 in. Post Adapter in Black with 3 Mailbox Mounting Options

The 4 in. x 4 in. Post Adapter can be used to attach any Architectural Mailboxes post mount mailbox to a 4 in. x 4 in. wood post. The adapter plate is constructed of heavy gauge galvanized steel and finished with a durable powder coat. The adapter includes mailbox mounting hardware and spacers used for T2 sized mailbox installation.

Universal mounting plate
Durable galvanized steel construction
Multiple mounting patterns
Includes installation instructions and assembly hardware
Supports up to a 50 lbs. mailbox

Choose from 3 different mounting options


Cantilever Mount	Top Mount	Side Mount

powder coated, easy installation

dimensions

Mounting Hole Pattern:

mailbox mounting plate

Product Description

The 4 in. x 4 in. Post Adapter can be used to attach any Architectural Mailboxes post mount mailbox to a 4 in. x 4 in. wood post. The adapter plate is constructed of heavy gauge galvanized steel and finished with a durable powder coat. The adapter includes mailbox mounting hardware and spacers used for T2 sized mailbox installation.

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Product information

Technical Details

Material

‎Metal

Color

‎Black

Included Security Features

‎Hopper & Baffle

Brand

‎ARCHITECTURAL MAILBOXES

Mounting Type

‎Post Mount

Product Dimensions

‎4.6"D x 6"W x 1.9"H

Style

‎7540B-10

Item Weight

‎1.5 Pounds

Access Location

‎Front

Manufacturer

‎Architectural Mailboxes

Part Number

‎7540B-10

Item Weight

‎1.5 pounds

Item model number

‎7540B-10

Is Discontinued By Manufacturer

‎No

Size

‎4" x 4"

Item Package Quantity

‎1

Included Components

‎4x4 Adapter Plate

Batteries Included?

‎No

Batteries Required?

‎No

Additional Information

ASIN

B0130EAWLO

Customer Reviews

4.6 2,238 ratings

4.6 out of 5 stars

Best Sellers Rank

#88,586 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement)
#68 in Post-Mount Mailboxes

Date First Available

July 21, 2015

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.

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Top Brand: ARCHITECTURAL MAILBOXES

Highly Rated

50K+ customers rate items from this brand highly

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	This Item ARCHITECTURAL MAILBOXES Architectural Mailboxes 7540B-10 4x4 Adapter Plate Accessory, 4" x 4", Black	Recommendations ARCHITECTURAL MAILBOXES Architectural Mailboxes Stratford Plastic Mailbox and Post Kit, SC000BAM, Black, Medium Capacity	dummy ARCHITECTURAL MAILBOXES Architectural Mailboxes 8760B-10 Carlisle Postmount Mailbox, Medium, Black	dummy Gibraltar Mailboxes Architectural Mailboxes AR15T0EC Arlington Mailboxes, Large, Textured Bronze	dummy ARCHITECTURAL MAILBOXES Architectural Mailboxes 8830B-10 Winston Nickel Flag Post Mount Mailbox, Medium, Black	dummy Gibraltar Mailboxes Stanley Extra-Large Capacity Galvanized Steel Grey, Post-Mount Mailbox, ST200000
	Buying options	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart
Price	—	-8% $99.94 Typical: $109.00	-32% $33.79 List: $49.99	-6% $65.00 List: $68.99	-36% $32.05 List: $49.99	$54.95
Delivery	—	Get it as soon as Thursday, May 9	Get it as soon as Thursday, May 9	Get it as soon as Thursday, May 9	Get it as soon as Thursday, May 9	Get it May 10 - 13
Customer Ratings	4.62,238	4.5113	4.6277	4.51,272	4.62,968	4.64,429
Sturdiness	4.5	4.0	4.3	4.1	4.1	4.3
Easy to install	4.3	4.2	4.5	4.4	4.5	4.6
Easy to assemble	—	4.4	4.9	4.4	4.7	4.7
Sold By	—	Amazon.com	Amazon.com	Amazon.com	Amazon.com	Factory Hardware Store
material	Metal	Plastic	Metal	Metal	Metal	Alloy Steel
capacity	—	925 cubic inches	835 cubic inches	1475 cubic inches	838 cubic inches	3175 cubic inches
mounting type	Post Mount	Post Mount	Post Mount	Post Mount	Post Mount	Post Mount
access location	Front	Front	Front	Front	Front	Front
security features	Hopper & Baffle	No additional security features	No additional security features	No additional security features	No additional security features	lock
style	7540B-10	Contemporary	Contemporary	Mailbox	Contemporary	Stanley
weight	1.5 pounds	17 pounds	—	8.38 pounds	5.3 pounds	9.8 pounds

Customer reviews

4.6 out of 5

2,238 global ratings

How customer reviews and ratings work

Customers say

Customers like the quality, mounting and value of the mailbox. They mention it's sturdy, well made and provides multiple choices for mounting. Some are satisfied with ease of installation, and compatibility. Opinions are mixed on hardware, holes, and fit.

AI-generated from the text of customer reviews

94 customers mention80 positive14 negative

Customers like the quality of the mailbox mount. They say it's sturdy, well-made, and easy to install. The mounting bracket is very strong but also very easy to put up, and it'll secure your mailbox quickly and easily. The bracket is made with galvanized steel and weighs almost 20 pounds. It has a good weather resistant finish and is the perfect stabilizer for a wooden post mount of larger mail boxes.

"Perfect for our new mailbox. Kept it on nice and strong" Read more

"...It's made with galvanized steel and weighs almost 20 pounds...." Read more

"...Screw it in and finished. The bracket has a good weather resistant finish, and there are multiple holes in pre-punched to adapt to almost any..." Read more

"...This mounting bracket is very strong but also very easy to put up. We needed something that was easy to install but also is very strong...." Read more

73 customers mention68 positive5 negative

Customers find the installation process of the mailbox bracket to be easy. They mention that the instructions are easy to follow and that it's simple to bolt on to the mailbox. Some say that the bracket makes installing a mailbox quicker and easier.

"This bracket fit my locking mailbox perfectly. Made install easy! Will work with 4X4 or a 4X6 post (which I used)" Read more

"Easy to install on post. Needed no additional supplies. Would certainly recommend" Read more

"...This mounting bracket is very strong but also very easy to put up. We needed something that was easy to install but also is very strong...." Read more

"...The only problem that it's shaky at times. Durable and easy to install." Read more

72 customers mention68 positive4 negative

Customers are satisfied with the compatibility of the adapter. They mention that it works well, is adequate, and is highly recommended. Some say that the adaptor is thicker, making it more solid and less prone to damage.

"...It worked perfectly. Thank you so much!" Read more

"...I do wish that they had used a heavier gauge sheet metal. It's adequate, but thicker would make it more solid and less prone to "caving."..." Read more

"Works great for my mailbox" Read more

"...had the holes installed but it's appeared to be a very sturdy and good product" Read more

24 customers mention20 positive4 negative

Customers like the mounting of the mailbox. They mention that it provides a nice look and multiple choices to adapt the mailbox mounting. It's sturdy and has lots of mounting points. It fits many mailbox installation configurations and adds stability to any mailbox.

"Perfect for our new mailbox. Kept it on nice and strong" Read more

"This provides a nice look and nice options for mounting, without plopping in an old wooden plank.A few oddities to note...." Read more

"Lots of mounting options however I’m not using a wood post. I’m using a metal post...." Read more

"Perfect for mounting a standard mailbox in a 4x4 post. Came with everything needed." Read more

23 customers mention18 positive5 negative

Customers like the value of the mailbox. They say it's good value for the money, worth the effort, and price.

"...Well worth the money." Read more

"...mounts and the plow breaking, finally bought this and it’s worth the money" Read more

"...I had to mount it upside down for it to work. It's a good price, though so if you are good at improvising this is a good buy." Read more

"...As-is, it was a complete waste of my money, time and effort." Read more

49 customers mention31 positive18 negative

Customers are mixed about the fit of the mailbox. Some mention that it fits their mailbox perfectly, while others say that it didn't fit. Some customers say that the screws, nuts, and bolts are not fitting together.

"This bracket fit my locking mailbox perfectly. Made install easy! Will work with 4X4 or a 4X6 post (which I used)" Read more

"...This plate comes with four plastic spacers, but they are too large for the side bolts for the Sequoia, so I had to saw a quarter inch off each." Read more

"This product fit on a straight post or a horizontal post. Fit my mailbox perfectly. The only problem that it's shaky at times...." Read more

"...The holes in the mailbox and mounting bracket, fit perfectly. In reality, should have mounted to the post without issues...." Read more

20 customers mention8 positive12 negative

Customers are mixed about the holes in the mailbox. Some mention that it has lots of pre-drilled holes to provide mounting options and extra holes for further attachments. However, others say that the critical holes did not line up, were in the wrong place, and were too big for the holes.

"Pretty sturdy. Too bad the screws were too big for the holes. Had to re-drill the holes." Read more

"...bracket has a good weather resistant finish, and there are multiple holes in pre-punched to adapt to almost any box and mounting situation...." Read more

"...Also, need to drill extra screw holes on parts attaching to side of post since they are precisely opposite from one side to next and long screws..." Read more

"Easy to install with lots of pre-drilled holes to provide mounting options, I used bolts this time and I expect I will not have to re-mount my..." Read more

14 customers mention6 positive8 negative

Customers are mixed about the hardware. Some mention that it comes with all the hardware needed to install it, while others say that it didn't have over half the hardware required.

"The mail box did not come with this adapter plate. So it was very necessary to buy this product. Made the installation of the mailbox very easy." Read more

"Easy to install on post. Needed no additional supplies. Would certainly recommend" Read more

"This mounting bracket came with a hodgepodge of assorted hardware that I think some drunk just threw together...." Read more

"Comes with hardware, for multiple choices to adapt the mailbox mounting...." Read more

Reviews with images

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Top reviews from the United States

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Perfect for locking mailbox

Reviewed in the United States on February 5, 2024

Verified Purchase

This bracket fit my locking mailbox perfectly. Made install easy! Will work with 4X4 or a 4X6 post (which I used)

Very happy to see that this was offered.

Reviewed in the United States on September 8, 2023

Verified Purchase

We ordered the mailbox and realized we needed to have a secure item for it. Thank you Amazon for offering this product and not having to look all over the place for the item. It worked perfectly. Thank you so much!

One person found this helpful

Samantha Wright

Reviewed in the United States on February 16, 2024

Verified Purchase

Perfect for our new mailbox. Kept it on nice and strong

Customer image

Facilitates Mailbox Installation On 4x4 Post. Corresponding Holes In Mailbox For Securing To Plate.

Reviewed in the United States on February 8, 2024

Verified Purchase

Purchased 2 on 05-10-2023 for $12.82.

We needed to replace our old, tired mailbox and the 4x4 on which it was anchored. They were 35 years old. RIP.

We opted for a large, LOCKABLE Oasis mailbox from Architectural Mailboxes to replace the bread loaf box. There are too many up-to-no-good weasels doing walk-by mail theft, so I suggest you get a LOCKABLE box, too.

The new box is much larger and heavier than the aluminum bread box. It's made with galvanized steel and weighs almost 20 pounds. I could screw/bolt it directly into wood, but I chose to use the 4x4 Adapter Kit to get layout options and to facilitate the installation.

The Adapter Kit includes the mounting plate, 2 brackets, and hardware (screws, nuts, washers, spacers). The large opening in the center is sized for the common "4x4," so the actual size is 3.5"x3.5".

With the included hardware, the 2 brackets first need to be attached to the plate in the orientation to match your layout. The brackets then are screwed onto the 4x4 (or "sistered" 2x4s) with wood screws, and the mailbox is secured to the plate using the matching holes.

In my application, I needed to mount 2 mailboxes side-by-side, so I could not attach the plate directly onto the 4x4 center post.

I made 2 sets of "sistered" 2x4s to attach to the 4x4. One on the front; the other on the back. A plate and mailbox would go on the left of the post, and another plate and mailbox on the right.

Holes were drilled through the center post and the 2 sets of sistered 2x4s. The three were secured together using 2 heavy-duty carriage bolts, torque washers, and nuts.

Yes, pressure treated lumber and galvanized steel or stainless steel hardware were used. Plus, I applied multiple, additional coats of wood sealant, too.

Each adapter plate is sitting on the 2 sistered 2x4s, front and back. Wood screws from the top through the plate and spacers. Wood screws from the sides through the brackets. The plate is anchored to the sistered 2x4s.

The opened Oasis mailbox is placed on the plate. At the open space between the front and back sistered 2x4s, located the hole positions that match between the plate and mailbox, insert screws (bolts), thread on nuts, tighten.

When I attached the screws/bolts and nuts, the nuts are INSIDE the mailbox. If the nuts are on the outside, someone can easily remove just the nuts and off comes the mailbox. If the nuts are on the inside, they can't be unthreaded completely without access from the inside, so the mailbox can't be lifted off.

So, the plates are anchored onto the sistered 2x4s, and the mailbox is anchored onto the plate. That's the installation method that I chose.

I do wish that they had used a heavier gauge sheet metal. It's adequate, but thicker would make it more solid and less prone to "caving." When you (over) drive a screw, the plate does crater from the head of the fastener.

If you want, you can eliminate the adapter plate and drive screws directly from the inside of the mailbox into the wood. I elected to use the adapters because they were inexpensive ($12.82 each) at the time of my purchase.

FYI, Architectural Mailboxes offers the same adapter that has 4 fixed flanges for the 4x4 instead of the 2 add-on brackets.

Perfect for mailbox same manufacturer

Reviewed in the United States on April 16, 2024

Verified Purchase

Easy to install on post. Needed no additional supplies. Would certainly recommend

Reviewed in the United States on October 22, 2023

Verified Purchase

I could have built a bracket, but this was so simple: plumb the 4x4 post and stick this bracket on it. Screw it in and finished.
The bracket has a good weather resistant finish, and there are multiple holes in pre-punched to adapt to almost any box and mounting situation.

Well worth the money.

Makes Install Easy

Reviewed in the United States on March 16, 2024

Verified Purchase

I had a large locking box to install so set on a 4 x 4 and added diagonal braces cut from a 4 x 4. Box is a rock!

Very easy to install

Reviewed in the United States on October 15, 2023

Verified Purchase

We didn’t have a mailbox for our cabin in the mountains and after finally getting permission to put one up my husband chose this mounting bracket. This mounting bracket is very strong but also very easy to put up. We needed something that was easy to install but also is very strong. This bracket does not disappoint

Top reviews from other countries

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Diana

Muy funcional y lo han estado utilizando el correo y paquetería

Reviewed in Mexico on May 15, 2021

Verified Purchase

Quedó exacto a la medida

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Amazon Customer

Very sturdy. Worth the purchase.

Reviewed in Canada on December 29, 2020

Verified Purchase

Had this for a couple of weeks now. Works very well. Our mailbox is nice and sturdy so far.

JC

Easy set up

Reviewed in Canada on July 10, 2022

Verified Purchase

Easy install, less than 30 minutes

Pher my Lord..!!

Gran calidad

Reviewed in Mexico on July 15, 2020

Verified Purchase

Un producto de gran calidad, buen material y una pintura perfecta. totalmente satisfecho con la compra.

Translate review to English

Sarah Zahnd

Mailbox fixed!

Reviewed in Canada on January 7, 2023

Verified Purchase

Mailbox was knocked over and this has fixed the situation nicely.

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