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The Salsbury 3300 Series Cluster Box Units (CBUs) are USPS-approved mailboxes designed for secure and efficient mail and package delivery. Manufactured by Salsbury Industries, these units are an ideal solution for both commercial and residential developments, including housing communities, apartment complexes, and townhomes. Engineered for long-term durability, each CBU is built from heavy-duty aluminum and stainless steel hardware and comes with a matching pedestal for a sleek, professional appearance.
Explore the top features of our USPS-accessible CBUs below:
✔ USPS Licensed & Approved – Manufactured by Salsbury Industries, an officially authorized CBU provider (License # 1CDSEQ-08-B-0026).
✔ Built to USPS "F" Specifications – Ensuring compliance and secure mail delivery.
✔ Ideal for Various Applications – Perfect for commercial and residential settings such as office buildings, apartments, and planned communities.
Heavy-Duty Construction – Made from rugged aluminum and stainless steel hardware for maximum durability.
✔ Matching Pedestal Included – A complete unit with a secure, freestanding base.
✔ Weather-Resistant Powder-Coated Finish – Available in sandstone, bronze, green, black, white, and gray (replacement units only) to match any environment.
✔ Front Access Design – Two easy-to-open master door panels allow quick access for mail carriers.
✔ Secure Locking System – Equipped with a heavy-duty 5-pin cylinder cam lock with a built-in dust/rain shield and three keys for each tenant door.
✔ Integrated Outgoing Mail Compartment – Includes a weather-protected flap and an 11-3/4" W x 3/4" H mail slot for added convenience.
✔ Carrier Access Door – Designed for USPS-installed master lock access.
✔ Industry-Leading Manufacturer – Salsbury Industries is an ISO 9001:2015 certified company with a legacy of excellence in mailbox manufacturing since 1936.
✔ Parcel Lockers for Package Delivery – Available in 1, 2, or 4 fully integrated lockers, with the following size options:
✔ Multiple Door Sizes Available:
With a perfect balance of security, durability, and compliance, Salsbury CBUs provide a reliable centralized mail solution for property managers, developers, and business owners.

Ships within 48 hours · Estimated delivery Jun 20 - Jun 25
US$40
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