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:
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Fully welded ¼" steel frame construction
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3/16" reinforced steel doors
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No rivets, spot welds, or removable panels
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Steel shell 3–4× thicker than standard CBUs
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Recessed doors that eliminate pry points - VERY IMPORTANT!
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Units weigh 250–550 lbs for true heavy-duty durability
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Larger-than-standard tenant compartments - For less package space needed
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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:
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Deter mail theft & protect residents’ packages
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Reduce long-term maintenance and replacement costs
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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.