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SKU: WL-3503SSUBM  |  View All 3 Door Surface Vertical Mailboxes

3 Door Vertical Mailbox Sandstone Surface Mounted USPS Access

(View all from Salsbury Industries)
List Price:
You Save:

$33.03 (20%)

Volume Discount Pricing
2 - 5$124.00
6+ $114.67
Per the USPS standards, vertical (4B) mailboxes are only to replace existing vertical (4B) mailboxes. All new construction should use 4C Cluster Mailboxes, per USPS regulations.
According to manufacturer:
Usually ships in 1 to 3 business days
Custom Engrave ships in 1 to 2 week
Note: Products ship directly from the manufacturer, Salsbury Industries

3 Door Vertical Mailbox Sandstone Surface Mounted USPS Access

Made entirely of aluminum, Salsbury 3500 series U.S.P.S. approved vertical mailboxes are available in surface mounted and recessed mounted units. The mailboxes feature 5-1/2" W x 16-1/4" H extruded aluminum doors and a durable powder coated finish available in five (5) contemporary colors - Aluminum, Brass, Bronze, Sandstone, and Green. Each mailbox door includes a five (5) pin cylinder cam lock with two (2) keys and a 2-1/2" W x 5/8" H indentation to accommodate a label (included) to identify the tenant’s name and/or box number. Mailboxes are available in units with three (3) to seven (7) compartments. Each compartment is 6-3/4" deep. Vertical mailboxes are ideal for apartments, condominiums, commercial buildings and many other applications.

Model: 3503
Description: 3 Doors
Unit Size:
18-3/4" W x 19" H x 7-1/2" D
25 lbs.

Vertical Mailbox Options

  • Outgoing mail slot - in the far left door of the unit unless otherwise specified (#3569)
  • Master commercial lock - with (2) keys - when units are for private access (#3575)
  • 4B+ Master door security retrofit kit (#3596)

Door Identification
Each mailbox door includes a 2-1/2" W x 5/8" H indentation to accommodate a label (included) to identify the tenant’s name and/or box number. Custom identification systems are available as an option upon request.


  • Each mailbox door includes a five (5) pin cylinder cam lock with (2) keys (1,000 different key changes) (#3590)
  • Additional keys per lock when ordering (#3598)
  • Key blanks - box of (50)

Letter Boxes
A letter box is an ideal way to collect outgoing mail or other correspondence.

Custom Engraving (Option #2266)
Custom engraving for letter boxes (specify regular or black filled) is available as an option upon request.

Outgoing Mail Slot (Option #2266)
A 4-3/8" W x 1/2" H outgoing mail slot is available as an option upon request. It will be located in the far left door of the unit unless otherwise specified. If a mail slot is requested, order unit with one additional compartment than the total number of tenants receiving mail.

Custom Engraved Placards (Option #3567)
2-1/2" W x 5/8" H custom engraved self-adhesive placards are available as an option upon request.

Recessed mounted units fit into a rough opening and are secured with mounting hardware through the back or side panels. Recessed units feature a fully integrated flanged
collar which fits over the rough opening.

Note: For U.S.P.S. accessed vertical mailboxes, the master lock in the top tier of mailboxes must be no more than 58" above the finished floor. The master lock in the bottom
tier of mailboxes must be no less than 30" above the finished floor. No more than two (2) tiers of mailboxes may be installed.

Rough opening for recessed mounted vertical mailboxes is 1-1/2" less than the unit’s width, 1-1/4" less than the unit’s height and equal to the unit’s depth.

Rough opening for recessed letter boxes (#2245) is 13-3/4" W x 17-3/4" H x 6-3/4" D.

Manufacturer Details:

About Salsbury Industries

Established in 1936, Salsbury Industries is the industry leader in manufacturing and distributing quality mailboxes, lockers and signage. Their organization prides itself in providing quality products. Mailboxes include cluster box units, 4B+ and 4C standard and custom horizontal mailboxes, vertical mailboxes, aluminum and brass mailboxes, free-standing mail centers, parcel lockers, courier boxes, drop boxes, letter boxes and a full line of residential mailboxes. Lockers include standard lockers, extra wide lockers, vented lockers, open access lockers, designer lockers, solid oak executive lockers, modular lockers, plastic lockers, storage lockers and storage cabinets. Signage includes large commercial signage, signature series plaques, cast aluminum plaques, custom plaques, directories, and numbers / letters.…

Browse More Products from Salsbury Industries

For Your Reference:

OUR SKU is 3503SSU

This item is also sometimes listed under the following manufacturer numbers:

Dimensions & Weight
Ship Weight:
3 Door Vertical Mailbox Sandstone Surface Mounted USPS Access
18.75 in. W x 19 in. H x 7.5 in. D
25.00 lbs
General Category:
Commercial Mailbox
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Have a question about this product?
Frequently Asked Questions
Question: Can I mount on the outside of a building? Is it waterproof?
Answer: No, our Vertical Mailboxes need to be mounted under an overhang or shelter of some sort. While they can be outside, direct exposure to the elements is not recommended.

3 Door Vertical Mailbox Sandstone Surface Mounted USPS Access
Shipping Information:

Shipping Estimate:

Usually ships in 1 to 3 business days
Custom Engrave ships in 1 to 2 week

Stock Status:

In Stock

Ships to:


Ship Method:

FedEx/UPS (Learn More)

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Wall Mount Mailboxes Locking Mailboxes Commercial Residential