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Postal 4C Horizontal Series

We meet the highest-quality standards set by the USPS. 4C Horizontal Mailboxes, are lightweight, easy to install and even easier to use. We offer many mailbox configurations to suite your individual project requirements. Choose from a variety of colors that will complement the architectural design of your building. All aluminum construction and fewer pry points ensure ultimate protection from all outside threats. An optional multi-unit connector kit eliminates the need for studs and offers easy, attractive, flush installation of multiple layouts in one wall opening.

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  • Lightweight for easier handling, installation, and reduced shipping costs
  • Triple bolt catch on two-five points, stainless steel lock (depending on size)
  • Exclusive “L” extrusion on every door to withstand prying
  • Full-length concealed hinge
  • Shelves riveted for added security
  • Easy-to-read number plates
  • Shelves are high impact polymer
  • Completely assembled and pre-drilled for easy installation
  • Modules available in both full and 1/2 sizes (4 or 8 compartments)
  • Meets Americans with Disabilities Act (ADA) standards


  • Multi-unit connector kits eliminating the need for studs and offering easy, attractive, flush installation of multiple layouts in one wall opening
  • Choose from our many configurations
  • Variety of colors to complement the architectural design of your building


U.S. Postal Service STD-4C Specifications

Effective October 5, 2006, all new designs approved for NEW CONSTRUCTION AND MAJOR RENOVATION require U.S. Postal Service STD-4C compliant mailbox systems. The new USPS 4C Standard includes the following specifications:

A new compartment form factor minimum size requirement of 12″w × 15″d × 3″h
Eliminates the vertical form factor (5″w × 6″d × 15″h) design
Introduces a parcel locker requirement based on a 1:10 parcel locker to customer compartment ratio
Strengthens security requirements for the entire receptacle
Standardizes and improves tenant compartment lock design
Adds testing requirements to verify acceptability for either indoor or outdoor use
Introduces quality management systems provisions
Enhances design flexibility for concept, ergonomics, and materials
Meets Americans with Disabilities Act (ADA) standards


Sand Stone
Textured Sand
Stone Gray
Dark Chocolate
Anodized Silver
Postal Grey