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Salsbury 3707D-12GRP 4C Mailboxes 12 Tenant Doors Rear Loading

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SKU: WL-3707D-12GRPBM  |  View All 12 Doors - Rear Loading Private 4C Mailbox
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Salsbury 3707D-12GRP 4C Mailboxes 12 Tenant Doors Rear Loading

Salsbury 4C Standard Horizontal Mailboxes Front or Rear Loading
Salsbury 3700 series 4C standard horizontal mailboxes and parcel lockers are made of heavy gauge aluminum and stainless steel hardware and USPS approved. Each standard mailbox door (MB1) is 13-1/4'' W x 3-1/4'' H and includes a heavy duty cam lock with a dust/rain shield and three (3) keys.

4C standard horizontal mailbox units include factory installed 3/4'' W x 1/4'' D trim and are available in configurations that are one door wide (single column) and two (2) doors wide (double column).

The Salsbury maximum height 3716D-20 units have two (2) fully integrated 15-1/2" high parcel lockers and twenty (20) MB1 mailbox doors. 4C requirement of a minimum of one parcel locker for every ten (10) tenant compartments. Many other standard units in 15, 13, 11, 9, 7 and 5 equivalent standard mailbox door heights are also available.

Fully integrated and stand-alone parcel lockers are available in five (5) equivalent standard mailbox door heights (PL5 – 17-1/4" high) and six (6) equivalent standard mailbox door heights (PL6 – 20-3/4" high). A compartment equivalent to two (2) 3-1/4'' high standard doors is used for outgoing mail collection and is labeled “Outgoing Mail."

Designed for indoor or outdoor use, 4C standard horizontal mailboxes feature a durable powder coated finish available in four (4) contemporary colors - Aluminum, Bronze, Gold, Sandstone.

If Rear Loading: The front of the two (2) high outgoing mail compartment is comprised of two (2) fixed panels and there is no USPS carrier access door. The rear of the unit incorporates one or two (2) access door(s) with heavy duty latches and continuous hinges.

If Front Loading: Units include one or two (2) master door(s) that swing(s) on continuous integral hinges. The two (2) high outgoing mail compartment includes the USPS carrier access door and cannot be used for mail distribution. The rear of the unit incorporates a solid rear cover.

Model: 3707D-12
Description: 12 MB1 Doors - no Parcel Lockers
Unit Size: 31-1/8" W x 27" H x 17'' D
Weight: 100 lbs.

4C Horizontal Mailbox Specifications and Options:

Mailbox Door Sizes
Each aluminum door includes a heavy duty five (5) pin cylinder cam lock with a dust/rain shield and three (3) keys.

The durable and corrosion resistant 4C units feature a powder coated finish available in aluminum, bronze, gold or sandstone. Custom finishes are available as an option upon request.

Parcel Locker Door Sizes
Parcel lockers offer tenants a convenient way to receive packages on site and are fit with a two (2) key security system.

Door Identification
Each 4C standard horizontal mailbox door has a 1'' high number. The outgoing mail compartment is labeled “Outgoing Mail" and the parcel locker(s) are labeled with a “1P", “2P", etc. Custom identification systems are available as an option upon request.

Outgoing Mail Compartments
One additional compartment in each unit is labeled “Outgoing Mail" and includes a weather protection flap and a 10-3/4" W x 3/4" H mail slot.

Custom Engraved Placards
1-3/4'' W x 1-1/2'' H custom engraved self-adhesive placards are available as an option upon request.

Custom Engraved Doors
Custom engraved door – regular or black filled

Options (for installations not serviced by the USPS)

  • Mail slots (#3769)
  • Standard slot size: 10" W x 3/4" H
  • Custom slot sizes are available upon request
  • Plexiglass window (#3771)


  • Each 4C mailbox door includes a heavy duty five (5) pin cylinder cam lock with a dust/rain shield and three (3) keys (2,000 different key changes). (#3790)
  • Additional keys per lock when ordering (#3398)
  • Key blanks - box of 50

Combination Lock
Three (3) digit single dial combination lock with spring latch and automatic throw-off (for installations not serviced by the USPS) (combination numbers can be changed by owner).

Master Commercial Lock
For carrier access door and parcel locker unit - if for private mail distribution.

Tenant Parcel Locker Lock
For parcel locker door - with (3) keys

For Your Reference:

OUR SKU is Salsbury Industries 3707D-12GRP

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

Dimensions & Weight
Ship Weight:
Salsbury 3707D-12GRP 4C Mailboxes 12 Tenant Doors Rear Loading
31.125 in. W x 27 in. H x 17 in. D
100.00 lbs
General Category:
Commercial Mailbox
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Frequently Asked Questions

Salsbury 3707D-12GRP 4C Mailboxes 12 Tenant Doors Rear Loading
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Regarding a Product's Shipping Estimate

Understanding Lead Times

The lead times listed on this product page represent the best-case scenario for shipping estimates. While we may show that a product "usually ships" within a given period, this period should not be confused with a delivery estimate. Rather, we expect the product to ship from the manufacturer's warehouse within this time-frame.

What does this mean for you? Once you place an order on our site, we begin processing the order with the manufacturer. The processing lead time we list on the product page is the most current estimate from the manufacturer regarding the product.

Below, we answer the top three FAQs our customers have regarding delivery estimates.


How long will it take to receive my commercial mailbox?

When you order a commercial or cluster mailbox, we process the order with the manufacturer within 1 business day. Once processed, the order usually ships in the time-frame listed on the product page. Since Cluster Mailboxes are large items, they ship via freight carriers. This means that the transit times for these will usually be 5 to 7 business days.

A few things to note about purchasing a cluster mailbox or similar large, commercial-grade product:

  • The freight carrier will call the number you list on the shipping address a day before delivery to schedule a delivery appointment with you.
  • The manufacturer ships using their chosen freight carrier depending on the products ordered and the delivery location.
  • The majority of online retailers who sell commercial mailboxes (CBUs, etc.) ship directly from the manufacturers, just as we do.
  • If you purchase a commercial mailbox from us and decide to cancel because a competitor lists a "faster" lead time on their site, you may be delaying the time it will take to receive your mailboxes. Why? Because you are placing a new order to be sent to the same manufacturer for processing.

What if I order multiple products from different brands?

If you ordered multiple products, it is possible that they are made by different manufacturers. If this is the case, your products will ship to you separately from each manufacturer.

For example, if you purchase a Mayne Post with a Whitehall Mailbox, your post will ship from Mayne's warehouse in about 3 business days, but your mailbox will ship separately from Whitehall in about 2 to 3 weeks if customized with address numbers.

How can I estimate my shipment's transit time?

Depending on the carrier and your location, transit times will vary. Delivery estimates are best projected using your carrier tracking number. Once your order ships, we'll send you a shipping confirmation email that includes your carrier (FedEx, UPS, YRC, etc.) and tracking number.

Note: If you place an order with us and do not receive an Order Confirmation email, check your spam inbox. If you still do not see an Order Confirmation email in your inbox, contact us right away at (866) 707-0008 . We will provide you with your Order Number and any other details you need.

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