Aluminum 3-Door Surface-Mount USPS Vertical Mailbox

USPS-approved Salsbury 3500 Series 4B vertical mailbox with three tenant compartments, made entirely of durable aluminum with a powder-coated finish. Designed for surface mounting to flat walls in apartments, condos, and commercial buildings, it includes tenant locks with two keys and a carrier access door for a USPS-provided master arrow lock.

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Key Features:

• USPS 4B Compliance: Approved for replacement/retrofit installations with carrier access for USPS arrow lock
• All-Aluminum Build: Rigid, powder-coated aluminum doors and trim resist scratching and corrosion
• Surface-Mount Installation: Secures through back panel to a flat surface; mounting hardware not included
• Secure Tenant Access: Each compartment includes a 5-pin cam lock with two keys
• Compact 3-Compartment Layout: Individual box size 5.5" W x 16.25" H x 6.75" D; overall 18.75" W x 19" H x 7.5" D

Please check the Product Data Sheet Here

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Specifications Table:

Specification	Details
Series	Salsbury 3500 Series 4B Vertical Mailboxes
Mounting Type	Surface mounted (secures through back panel)
Number of Compartments	3
Overall Dimensions	18.75 in W x 19 in H x 7.5 in D
Individual Compartment Size	5.5 in W x 16.25 in H x 6.75 in D
Material	All aluminum
Finish	Durable powder coated (aluminum color; also available in bronze and sandstone)
USPS Approval	Manufactured to USPS-STD-4B; approved for replacement/retrofit installations
Tenant Locks	5-pin cylinder cam locks; two keys per door included
Carrier Access	Door prepared for USPS-provided master arrow lock
Door/Trim Features	Striated to resist scratching
Ideal Use	Apartments, condominiums, and commercial buildings
Unit Weight	25 lb

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Frequently Asked Questions (FAQ):

Q: Is this mailbox USPS approved?
A: Yes. It is manufactured to USPS-STD-4B and is approved for replacement/retrofit installations with USPS carrier access.

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Q: How is it installed?
A: It surface-mounts directly to a flat wall and is secured through the back panel. Mounting hardware is not included.

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Q: What locks are included?
A: Each tenant door has a 5‑pin cylinder cam lock with two keys. The USPS master arrow lock is provided and installed by the Postal Service.

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Q: What are the dimensions?
A: Overall: 18.75" W x 19" H x 7.5" D. Individual compartment: 5.5" W x 16.25" H x 6.75" D.

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Q: Is labeling available?
A: Optional custom engraved placards are available for door numbering.

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Streamlined Aluminum Mail Center, Purpose-Built for Multi‑Tenant Elegance

This vertical mailbox brings a crisp, architectural profile to common corridors, pairing striated aluminum doors with a robust, powder‑coated frame. The three-door configuration reads as a refined rhythm, while the surface-mount design keeps walls clean and orderly. Style it with minimal black numbering and warm wood paneling to elevate a lobby’s material story. It’s a discreet essential that delivers daily function with polished, modern poise.

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Upgrade your building’s mail delivery with this USPS-approved, all‑aluminum 3‑door vertical mailbox—built to install easily and last for years.

Installation