Fort Knox Large Standard Mailbox – Mailbox Big Box
Mailbox Big Box


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Fort Knox Large Standard Mailbox



The maximum security locking mailbox that started it all. The Fort Knox large standard is almost 100 pounds of solid steel (96 to be exact) tough enough to stop even the most determined mail thief.


This product page is for the large standard which will hold 2 weeks of mail. If don't need that much space have a look at the small standard here which will give you 1 weeks worth of mail storage. 


Both the Fort Knox small standard and large standard mailboxes are built to the same specifications.


If mail security is your number one priority when choosing a mailbox. Look no further than the famous Fort Knox Mailboxes - commonly referred to as a safe mounted on a post! 


Our Fort Knox Large Standard mailbox has an anti-fishing measure with nearly 6 inches of metal extension shelf at the incoming mail slot so if someone were to try and put a “fishing line” down into the box to grab the mail, the mail would catch on the extension shelf, drop back down, and would not come out of the incoming mail slot.


Shop with confidence as Mailbox Big Box proudly offers the lowest prices available anywhere on all Fort Knox Mailboxes




  • 2 weeks of mail storage
  • 2 high-security tubular keys
  • 7 pin tubular lock
  • Hand welded 1/4" steel shell and 3/16" reinforced steel doors
  • Accepts small parcels
  • Powder coated inside and out for durability
  • Free address numbers for the front door




  • Powder coated red mail flag
  • 57" steel in-ground post - install using a concrete pour
  • Newspaper box - comes pre-welded to the post
  • High-security slam lock for locked up packages with 2 keys


When you are expecting a parcel, leave the door slightly open and the parcel carrier can put the parcel inside, close the door firmly - locking it until you are ready to collect it.


  • The large standard is highly customizable with rear door access, premium extra keys, mail trays and more. Use the chat window below to let us know what additional options you need.




  • Can be installed in masonry applications, with a breakaway post and other post materials 
  • Pre-drilled for the large standard Fort Knox in-ground post 






About Fort Knox Mailboxes




Non-customized order - Dispatches in 3 - 5 working days
Customized order - Dispatches in 7 - 10 working days