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Aluminum Private Mailboxes: 2900 Series
Rack Ladder Installation, Rear Loading

Security 2900 Series mailboxes were designed by the U.S. Postal service for use in postal centers.  The all aluminum construction features 1/4" extruded aluminum doors with a 5-pin cam lock (1000) changes and 2 keys.


  • Available in 1, 2, 3, 8 or 12 compartments
  • Finish: Silver Powder coat with black trim
  • Option: Vertical Engraved identification


Doors: U.S. Postal Service approved, extruded aluminum and has concealed hinge.

Lock: Special lock designed and approved by U.S. Postal Service.

Door Identification: Clear Mylar label with black lettering available for purchase through manufacturer.

Rack Ladder and Standard Systems:
Aluminum mailboxes designed and engineered by the U.S. Postal Service. They are available in a rack ladder or standard installation system.  With either system, each mailbox unit has 1/4" extruded aluminum doors with a lock and two (2) keys per opening. The mailbox compartments have open backs and are constructed of all aluminum. 

Rack Ladder Systems:
Rack ladder system mailbox units are designed to be installed between rack ladders. The rack ladders support five (5) mailbox units to form a column of mailboxes. The first column of mailbox units requires two (2) rack ladders, and each additional column in the same configuration requires another rack ladder. These units have the same outside dimensions regardless of individual door sizes.         

SMC Products
Cluster Box Units
4C & Horizontal
Postal Specialty
Private Mailbox
Secure Locking Mailbox
Vertical Mailbox

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Download Aluminum Mailbox product brochure (48kb pdf)

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1 Door

  22" x 11

 559mm x 292

 2 Doors

  10 " x 11

 267mm x 292

 4 Doors

10 x 5

 273mm x 140

 8 Doors

5 x 5

 140mm x 140

 12 Doors

  3 " x 5  89mm x 140


Finished in silver powder coat with black trim

silver powder coat

black finish


 Weight Chart

  • 2912: 31 lbs
  • 2908: 28
  • 2904: 25
  • 2902: 24
  • 2901: 23
  • Rack Ladders: 25


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[Contact Sales Team]

  Security Manufacturing Corp.
   700 Freeport Pky Ste 300, Coppell, TX  75019 
   Tel: 800-POBOXES - (800-762-6937)