The Cluster Box Units (CBU) 1/4" Steel Neighborhood Security Mailbox

Our Cluster Box Units (CBUs) are custom-built to meet the specific needs of each community and are designed as a long-term infrastructure solution — This is not a disposable product.

What Sets Our CBUs Apart:

• Fully welded ¼" steel frame construction

• 3/16" reinforced steel doors

• No rivets, spot welds, or removable panels

• Steel shell 3–4× thicker than standard CBUs

• Recessed doors that eliminate pry points - VERY IMPORTANT!

• Units weigh 250–550 lbs for true heavy-duty durability

• Larger-than-standard tenant compartments - For less package space needed
  

• Optional outgoing mail sections eliminate pry vulnerabilities commonly seen in traditional CBU designs - Ours are completely welded

• Custom durable stands both in-ground and surface mount for extreme strength for multiple install surface types

We offer configurations from 8 to 14 tenant compartments per unit, with custom layout options including outgoing and package compartments as needed.

Our CBUs are built to help:

• Deter mail theft & protect residents’ packages

• Reduce long-term maintenance and replacement costs

• Provide a secure, professional installation for your community

Important Note:
USPS approval is required for installation of their Arrow Lock. Our CBUs require both front and rear access — one side for the mail carrier and the other for tenants.  Our CBUs exceeds postal requirements.

Request a Custom Quote

We would be happy to provide a detailed quote for your custom CBU project.

Please complete the “Get More Information” form by clicking the green button below. The form takes only a few minutes to complete and allows us to prepare options tailored specifically to your community.

If you prefer, you’re also welcome to contact us directly.

(800) 206-8067 or info@fortknoxmailbox.com

Thank you for considering Fort Knox Mailbox to protect your neighborhood’s mail and packages.