4C Front-Loading Aluminum Mailbox, 4 Doors + PL5 Locker

USPS-approved 4C horizontal mailbox by Salsbury Industries, built from heavy-duty aluminum with stainless hardware and a durable powder-coated finish. This recessed unit features four tenant MB1 doors, one large PL5 parcel locker, an outgoing mail slot, and secure cam locks—ideal for apartments, commercial buildings, and residential developments.

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Key Features:

• USPS-STD-4C Compliant: Front-loading design with carrier access door for USPS master lock
• Durable Construction: Heavy-duty aluminum body with stainless steel hardware and powder-coated finish
• Secure Access: Heavy duty cam locks, numbered compartments, and anti-fish plate on outgoing slot
• Tenant Capacity: Four MB1 doors (3-1/4 in. H x 13-1/4 in. W each) plus one PL5 parcel locker (17-1/4 in. H)
• Recessed Installation: Includes factory-installed trim and connector kit; suitable for indoor/outdoor use

Please check the Product Data Sheet Here

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Specifications Table:

Specification	Details
Series	Salsbury 3700 Series 4C Horizontal Mailboxes
Mounting Type	Recessed, front-loading, USPS access
Overall Dimensions	17 in. W x 41.375 in. H x 16.5 in. D (approx.)
Weight	70 lbs
Material	Heavy-duty aluminum with stainless steel hardware
Finish	Durable powder coated (aluminum color shown; bronze, gold, sandstone available)
Tenant Doors	4 MB1 doors, each 3-1/4 in. H x 13-1/4 in. W
Parcel Locker	1 PL5 locker, 17-1/4 in. H (fully integrated)
Outgoing Mail	10-3/4 in. W x 3/4 in. H slot with weather hood; anti-fish plate
Locks	Heavy duty cam locks with dust/rain shield and 3 keys per tenant door; USPS master lock installed by USPS
Compliance	USPS-STD-4C; ADA height compliant units available
Included	Factory-installed trim, solid rear cover, and 4C connector kit
Use	Indoor or outdoor; ideal for apartments, commercial buildings, residential developments

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Frequently Asked Questions (FAQ):

Q: Is this mailbox USPS approved?
A: Yes. It is manufactured to USPS-STD-4C and includes a carrier access door for the USPS-provided master arrow lock.

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Q: How many tenant compartments are included?
A: Four MB1 tenant mail doors and one PL5 parcel locker, plus an outgoing mail slot.

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Q: Can this be used outdoors?
A: Yes, it is designed for indoor or outdoor use with a durable powder-coated aluminum construction.

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Q: What are the overall dimensions?
A: Approximately 17 in. W x 41.375 in. H x 16.5 in. D for the recessed unit.

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Q: Does it include locks and keys?
A: Tenant doors include heavy-duty cam locks with dust/rain shields and 3 keys per door; USPS master lock is installed by USPS.

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Streamlined Mail Center with Architectural Poise

This 4C mailbox tucks neatly into a wall, creating a polished, architectural moment in lobbies and corridors. The crisp aluminum finish and precisely numbered doors feel tailored and intentional, while the integrated parcel locker adds modern convenience. Pair it with warm woods and matte black accents to elevate multifamily common areas. It’s a functional luxury that organizes the everyday with style.

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Upgrade your mail center with this USPS-approved 4C unit for secure delivery and a clean, professional look—order today.

Installation