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Internet # 100055114

Model # 5105B

Store SKU # 1000055525

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46-1/2 in. Standard In-Ground Post in Black

$96.99
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  • Powder coated finish resists all kinds of weather
  • Post and mounting plate are one welded piece for durability
  • Square in-ground post
  • View More Details

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Product Details

About This Product

Keep your curb looking sharp with the Architectural Mailboxes Standard In-Ground mail box post. Made from heavy-duty galvanized steel, this sleek, square mailbox post brings serious strength with a clean, modern look that never goes out of style. The commercial-grade, powder-coated finish keeps it protected from the elements so it stays looking fresh year after year. Designed for in-ground installation and set in concrete, it creates a sturdy, long-lasting base for your mailbox. All hardware and instructions are included, making this mail box post for outside as easy to install as it is to love.

Highlights

  • Galvanized steel construction makes this mail box post one of the most reliable metal mailbox posts for outside use
  • Powder-coated surface adds an extra layer of protection to this mail box post, preventing corrosion in all climates
  • Designed for in-ground installation and set in concrete, this mail box post creates a sturdy, long-lasting base for your mailbox
  • Designed to handle up to 200 lbs. this mail box post for outside delivers serious stability for larger mailboxes
  • Made to mount effortlessly with Architectural Mailboxes curbside mailboxes marked with letters H or K
  • Fully assembled and ready to install giving you a smooth, no-fuss setup from start to finish
  • Includes mailbox post, installation and mounting hardware; Mailbox sold separately
  • Welded top mounting plate creates a sturdy, reliable base for your mail box post for outside
  • Iconic, timeless mailbox post style complements both new and historic homes, making it a versatile choice for any setting
  • Thoughtfully engineered with a focus on durability, function, and style
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Product Information

Internet # 100055114

Model # 5105B

Store SKU # 1000055525

Specifications

Dimensions: H 46.5 in, W 6.0 in, D 12.0 in

Dimensions

Product Depth (in.)

12.0 in

Product Height (in.)

46.5 in

Product Width (in.)

6.0 in

Details

Color

Black

Features

Fade Resistant

Hardware Color Family

Black

Hub Required

No hub connection available

Included

Brackets, Mounting Hardware, Posts

Post Installation Type

In-Ground

Post Material

Steel

Product Weight (lb.)

20.68 lb

Returnable

90-Day

Weight Capacity (lb.)

200

Warranty / Certifications

Manufacturer Warranty

3 Year

Questions & Answers

can I put a post inside it to make it taller or set deeper into the ground? it doesn't make sense to me that it's made to be set in concrete but comes literally exactly how tall it should be off the ground to start....
ByOct 14, 2026
1 Answer | 
Answer This Question

Thank you for your interest in our products. We understand your concern regarding the post height and the amount of post available for installation below ground. The post measures 46.5 inches in height and is designed to accommodate the general USPS mailbox height guidelines of 41–45 inches, measured from the road surface to the inside surface where mail is placed or to the lowest edge of the mail entry, as applicable. However, the installation depth will depend on the height of the curb and the elevation of the surrounding ground. Because the mailbox height is measured from the road surface, the curb height must be taken into consideration when determining how deep the post can be installed while maintaining the required height. Depending on your installation site, setting the post deeper in the ground may result in the mailbox being too low. We cannot recommend inserting an additional post inside the existing post or modifying the post to increase its height, as this has not been tested or approved by our company. We recommend contacting your local post office before installation to confirm the appropriate mailbox height and placement for your specific location.

By|Oct 14, 2026


    Does this work with Oasis Tribolt Mailbox?
    ByApr 30, 2026
    1 Answer | 
    Answer This Question

    Thank you for your interest in our products. Both items are compatible.

    By|May 12, 2026


      is the post one piece or two pieces that need to be screwed together ,
      ByApr 4, 2026
      1 Answer | 
      Answer This Question

      Thank you for your interest in our products. This post is one piece.

      By|Apr 10, 2026

        (2)

        The bolt hole pattern of the large (B) Elite mail box does fit the pattern of the 46.5" post. So why do you say it won't fit?
        ByMar 23, 2026
        1 Answer | 
        Answer This Question

        Thank you for your interest in our products. The 5105 post has a compatability code of H or K. It is not compatible with the Elite. Please see link to compatible models. https://www.architecturalmailboxes.com/shop/?yith_wcan=1&product_cat=post-mount-mailboxes&filter_post-compatibility=h,k&query_type_post-compatibility=or

        By|Mar 25, 2026


          Will this work with an Architectural Designs ELITE large mailbox?
          ByMar 22, 2026
          1 Answer | 
          Answer This Question

          Thank you for your interest in our products. No, the Standard in- Ground post is not compatible with the Elite large mailbox.

          By|Mar 23, 2026


            Do I need a wood post for this to slide over or is this post all I need?
            ByFeb 15, 2026
            1 Answer | 
            Answer This Question

            Thank you for your interest in our products. This post is intended to be installed in the ground and secured with concrete.

            By|Feb 17, 2026


              Will this post be able to hold 2 of the Architectural Oasis Classic Graphite Bronze, Extra Large, Steel mailboxes as long as I mount an adaptor?
              ByNov 23, 2025
              1 Answer | 
              Answer This Question

              Thank for you your interest in our products. Yes this post can support up to 200lbs.

              By|Nov 25, 2025


                Will this work with Oasis 360? If not, please update the Oasis 360 product page which states "Works with Architectural Mailboxes post models 5105, 5106, 5525, 5526, 7507 and 7516". Which model posts work with Oasis 360?
                ByAug 8, 2025
                1 Answer | 
                Answer This Question

                Thank you for your interest in our products. Please see link to post that are compatible with the Oasis 360. https://www.architecturalmailboxes.com/shop/?yith_wcan=1&product_cat=mailbox-posts&filter_post-compatibility=j&query_type_post-compatibility=or

                By|Aug 8, 2025


                  Viewing 1-8 of 18

                  Customer Reviews

                  4.7 out of 5

                  • 4.7 out of 96 reviews
                  • 93% recommend this product
                  Filter by:
                  Showing 1-10 of 96 reviews
                  I like this post for my mailbox much better than wood. First it's strong and wont rot or break, second it looks cleaner and nicer than wood, and third in a few years it won't be as worn or old looking as wood gets after a few winters. Highly recommend.
                  by
                  • Verified Purchase
                  Post worked great with my Architectural Mailbox.
                  by
                  • Verified Purchase
                  1 found this review helpful
                  Purchased with the "Architectural Oasis Post-Mount or Column-Mount Locking Mailbox in Black with ...
                  Purchased with the "Architectural Oasis Post-Mount or Column-Mount Locking Mailbox in Black with Outgoing Mail Indicator" mailbox to make a sturdy installation. It matches perfectly to the mount pattern for bolts, BUT did not include any bolts (screws), nuts, or washers! Went back to store and got 4 - 3/8th, 1-inch screws with double lock washers & nuts and this came out to perfect length protruding under box. One bag of quickrete was sufficient securing this 48.3 pound mailbox & post in place....
                  by
                  • Verified Purchase
                  • Recommended
                  3 found this review helpful
                  Well, it's a post...
                  I purchased this post to go with the mailbox by the same manufacturer. The colors matched exactly, the metal is heavy enough gauge that it is pretty solid and with the paint I do not see a need for maintenance for some time to come. I intend to eventually put a planter or shrubs around it to spiff it up a bit. I haven't measured but am pretty sure a majority of two piece planters will fit around the base when the time comes and that is the route I go. The biggest gripe I would have is that I wish it were a bit taller to allow more of a base to sit in the concrete I put it in. For my local regulations (be sure to check the street proximity and height requirements or your town / neighborhood) a majority of the post needed to be above ground allowing only about 6 inches of post in concrete. Maybe that is enough and maybe I'm just a guy who prefers to overbuild everything? Regardless, now that the 'crete has dried it is solid to the touch and does not wobble at all. Much more sturdy than most wood or plastic posts on the street I'd guess.
                  by
                  • DIY
                  • Verified Purchase
                  • Recommended
                  3 found this review helpful
                  Awesome Mailbox Post
                  My handyman did not want to drill out more concrete so cut 13 inches off bottom of post to install with 'L' brackets to cement. Very sturdy and post with attached mounting plate works perfectly with Oasis Jr. mailbox. Great product. I highly recommend purchasing both together.
                  by
                  • DIY
                  • Verified Purchase
                  • Recommended
                  1 found this review helpful
                  Strong, sturdy post
                  Just what I expected, a well-built, heavy-duty post. Not cheap, but worth the money. Set with 90 pounds of cement around and inside the hollow middle, I hope I never back into the thing.
                  by
                  • DIY
                  • Verified Purchase
                  • Recommended
                  4 found this review helpful
                  This customer chose to rate the product and not provide text.
                  by
                  This customer chose to rate the product and not provide text.
                  by
                  • Verified Purchase
                  Very durable and sturdy. Supports nicely a big Oasis mailbox.
                  by
                  • Verified Purchase
                  This post was shorter than expected once you factor the USPS height requirement for mail box height. Plan on buying a treated 4x4 post to slip inside for additional length for proper setting in concrete. The metal post was of good quality and heavy duty.
                  by
                  • Verified Purchase
                  Showing 1-10 of 96 reviews

                  Compare Key Features

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                  Product Snapshot

                  Built for durability with heavy-gauge steel and powder-coated finish. Ideal for homeowners seeking a sturdy, in-ground mailbox post.
                  Built for secure mailbox mounting: heavy-duty galvanized steel post and baseplate for surface or wood post installations.
                  Perfect for upgrading your home with rust-resistant aluminum post, adding style and functionality.
                  Built for durability with heavy-duty aluminum construction and a durable powder-coated finish. Ideal for homeowners seeking a robust and stylish mailbox post.

                  Height

                  46.5 in.
                  27 in.
                  56.41 in
                  32 in.

                  Weight Capacity

                  200 lb
                  250 lb
                  60 lbs
                  125 lb

                  Material

                  Steel
                  Galvanized Steel
                  Aluminum and steel
                  Aluminum

                  Weather-Resistant

                  Rust-Resistant