Fort Knox Mailboxes are Indestructible
Heavy-duty locking mailboxes and package boxes built from welded steel in Grants Pass, Oregon.
We built our company with one thing in mind: to build a box that thieves can't ever break into. By focusing on each component — the steel, the welding, the hinges, the doors, the locks, and the mail slot — we created the industry's toughest, most secure mailboxes BUILT LIKE A TANK!
A security mailbox should be more than a thin metal box with a lock added to the front. The body, door, hinge, lock, mail opening, welds, mounting system, and finish all affect how well the mailbox can resist prying, impact, reach-in attempts, weather, and years of everyday use.
Fort Knox Mailbox has been building heavy-duty steel security products since 1994. Our construction is intentionally heavier than a typical residential mailbox because we design the entire box around long-term protection of mail and packages—not simply around minimum material use.
Heavy Steel Is the Foundation
Steel thickness is one of the first differences customers notice when they compare a Fort Knox Mailbox with a conventional locking mailbox. The Bunker uses 1/8" steel to provide serious protection in a smaller, lighter model. The Enforcer and many of our larger high-security mailboxes and package receptacles use 1/4" steel bodies.
That extra material adds weight, rigidity, and resistance to bending. It also gives our welds, hinges, locks, and reinforced doors a much stronger structure to work with. Instead of treating the lock as the only security feature, we build the entire steel shell as part of the security system.
For exact size, weight, storage, and steel specifications by model, use our mailbox comparison guide.
Recessed, Reinforced Steel Doors
A lock can be excellent and still be defeated if the surrounding door flexes or leaves an easy place for a pry bar. That is why Fort Knox doors are designed as a complete assembly rather than as a thin panel with a lock mounted through it.
Our main retrieval doors are 3/16" steel, recessed into the body to reduce exposed pry points, and supported by a 2" continuous steel hinge. Reinforcement welded to the door adds stiffness where it matters most.
The result is a heavy door that works together with the mailbox body, hinge, and lock instead of asking one small component to do all of the work.
Hand-Welded Construction
Fort Knox Mailboxes are fabricated and welded by people who build security products every day. Welding lets the body, back plates, hinges, doors, reinforcement, and other structural pieces become one rigid assembly.
We do not design the mailbox around spot-welded sheet metal or a collection of riveted panels. A security box takes repeated stress at seams, corners, hinges, and lock areas, so those connection points matter just as much as the thickness of the steel itself.
Our goal is simple: when force is applied to one area, the rest of the structure should help resist it.
Mail Slots Designed to Limit Reach-In Access
Incoming mail has to be easy for the carrier to deliver but difficult for someone outside the mailbox to retrieve. Our standard incoming mail openings are approximately 1.75" high, keeping the opening narrow while allowing normal mail delivery.
Behind the opening, an interior steel extension projects into the mailbox to make a straight reach toward stored mail more difficult. On applicable models, this also works as an anti-fishing barrier by interrupting the path back out through the delivery opening.
Different Fort Knox models handle mail and packages in different ways. If package capacity is your priority, compare our secure package receptacles.
Locks Matched to the Job
The lock is important, but it works best when it is supported by a heavy door and rigid steel body. Many Fort Knox mailbox models include a 7-pin tubular lock, while certain package-oriented designs use other lock systems as standard. Depending on the model, upgrades can include Medeco®, slam-lock, combination, and Vault Lock Extreme options.
Need help choosing? See our lock and mailbox accessories or contact us for the best option for your application.
7 PIN Tumbler lock
Medeco® Cam Lock
Slam lock
The Vault lock extreme
Even the Mail Flag Is Heavy Steel
Small details tell you a lot about how a product is built. When a Fort Knox mailbox is ordered with an outgoing-mail flag, we do not finish the job with a lightweight plastic flag.
- The Bunker: 1/8" steel flag
- The Enforcer: 3/16" steel flag
- Many larger models: 1/4" steel flag
Flag and outgoing-mail configurations vary by model, so check the product page for the exact setup available on the mailbox you are considering.
Steel Posts Built for Heavy Mailboxes
A 40-, 70-, 100-, or 200-plus-pound security mailbox needs a mounting system designed for the load. Fort Knox posts are made from heavy square steel tubing and are sized to match the mailbox family they support.
The mailbox bolts to the post plate from underneath, with the fastening hardware secured from inside the locked box. In-ground posts are designed to be set in concrete. Surface-mount and multi-mailbox mounting options are also available for many applications.
Before installing, review our mailbox installation guide and always have underground utilities located before digging.
Sand Blasting & Powder Coating
Durability is not only about the steel underneath—it is also about protecting that steel from the environment. After fabrication, our mailboxes are sand blasted to remove oil, residue, and surface contamination so the finish can bond to clean metal.
The box is then heated and coated with electrostatically applied powder before going back into the oven to cure at approximately 400°F. Unlike wet paint, powder coating forms a durable baked-on finish designed for outdoor use.
Glossy Black and Slate Gray are our standard finishes, with custom solid colors available on many products. View the RAL color chart.
Final Inspection & Packaging
Before a Fort Knox Mailbox leaves our Oregon shop, it is checked by a real person. Locks, doors, hinges, finish, address numbers, and ordered accessories are reviewed before the unit is prepared for shipment.
Heavy steel products require serious packaging. We use protective wrap, high-density foam, double-corrugated cardboard, tape, strapping, and additional protection appropriate to the size and weight of the shipment.
Our 5-2-1 warranty reflects the same focus on long-term structure, hardware, and finish.
Shipping Heavy Steel Safely
Our products range from compact heavy-duty mailboxes to very large package vaults weighing hundreds of pounds. Smaller units generally ship by parcel carrier, while heavier products and multi-box orders ship by freight on a pallet.
Freight service protects large units during transit and gives us better options for residential delivery, terminal pickup, liftgate service, and other delivery needs. The exact shipping method depends on the product and order.
Have a shipping question before ordering? Our FAQ covers common questions, or contact our team for help.
Built Differently Because Security Depends on the Details
A Fort Knox Mailbox is not designed to be the cheapest or lightest box at the curb. It is built for customers who want a heavy-duty locking mailbox or package box that combines thick steel, welded construction, reinforced doors, serious locks, weather-resistant finishing, and a mounting system designed for the weight.
If you are deciding which model fits your household, business, package volume, or storage needs, start with our comparison guides below.
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