Salsbury Industries is the benchmark brand for commercial-grade mailboxes and lockers in the United States. With nearly 90 years of manufacturing history, Salsbury supplies multi-tenant mailbox systems to apartment complexes, office buildings, condominium associations, and commercial facilities, as well as individual USPS-approved cluster mailboxes for residential subdivisions. SecureZoned carries Salsbury because their products represent the clearest path to USPS compliance and commercial durability for property managers and building owners.
Every Salsbury mailbox system that requires USPS approval ships with the relevant STD-4C or STD-4B+D certification, which is mandatory for any new construction or renovation project receiving centralized mail delivery. The steel-gauge, lock cylinder, and compartment size specifications are governed by USPS requirements, and Salsbury builds to those specs consistently across production runs. This matters for property managers because a non-compliant mailbox system means the postal carrier won't deliver — a problem that takes months and thousands of dollars to correct after installation.
Beyond mailboxes, Salsbury manufactures a full range of commercial lockers: employee storage lockers for warehouses and manufacturing facilities, athletic lockers for gyms and schools, and electronic keypad lockers for shared-use environments. All locker lines are available in multiple heights, widths, and configurations to match specific space requirements, and most ship flat-assembled for on-site installation without specialized tools.
| Product Type | USPS Approved | Best Application |
|---|---|---|
| 4C Horizontal Mailboxes | Yes (STD-4C) | New construction, apartment buildings |
| Cluster Box Units (CBU) | Yes | Subdivisions, HOA communities |
| 4B+ Mailboxes | Yes (STD-4B+D) | Existing building renovations |
| Outdoor Parcel Lockers | Varies by model | Package delivery in multi-unit buildings |
| Commercial Lockers | N/A | Gyms, schools, offices, warehouses |
USPS Standard 4C specifies the exact compartment dimensions, door thickness, lock cylinder requirements, and carrier access panel design that any centralized mailbox system must meet for new construction or renovation. Buildings that install non-4C systems risk USPS refusing to deliver mail to those units — forcing the property manager to replace the entire system before mail service is restored. Salsbury's 4C-approved systems arrive with certification documentation for your permit package.
Yes. Salsbury 4C systems are modular — you configure the number of tenant compartments, the number of parcel lockers, the column arrangement, and the surface finish (powder coat color or stainless) to match your building layout. SecureZoned can help you specify the right configuration based on unit count and delivery volume. Custom configurations typically ship in 2 to 4 weeks.
Salsbury's athletic locker line covers single-tier (full-height), double-tier, and triple-tier configurations in steel or heavy-duty polymer. For a gym, the most popular choice is double-tier steel with a vented door panel for air circulation. Locker widths range from 12 to 18 inches, and you can order with hasp-ready doors for padlocks or with integrated combination locks. ADA-compliant heights and depths are available in the line.
