4C Mailboxes USPS Approved

4C Horizontal mailboxes are ideal for indoor and outdoor use and are extremely durable. They come in a variety of sizes and four contemporary colors, aluminum, bronze, sandstone, and black. The number of compartments and parcel lockers vary, so you will be able to find the perfect mailbox for your building.

These mailboxes include an outgoing mail slot with an anti-fish plate, heavy-duty cam locks for each tenant door with three keys, spacious compartments, and secure parcel lockers.

According to USPS regulations, the property owners, builders, or developers are responsible for 4C mailboxes. The USPS’sPostal Operations Manual states, “Purchase, installation, and maintenance of mail receptacles are the responsibility of the customer.”

Salsbury Industries manufactures a wide variety of durable, heavy-duty USPS STD-4C Horizontal mailboxes that are required for new construction and/or major renovations. Check out all the 4C mailboxes we offer here.

Salsbury 4C mailboxes are made of heavy-duty aluminum and stainless steel hardware and feature a durable powder coated finish that will stand up well to harsh weather conditions. The outgoing mail compartment also includes a weather protection flap.

Centralized mail delivery is a mail delivery system in which the mail carrier delivers mail for multiple residences at one central location.

Salsbury Industries’ 4C mailboxes include mailboxes and parcel lockers that fall within ADA height requirements.

A parcel locker is a lockable compartment designed to hold packages that will not fit in a standard mailbox compartment.

When a mail carrier is unable to fit a package into a standard mailbox compartment, they will place your package in a parcel locker. The carrier will then leave the key to the parcel locker in your mailbox. (If you look up the USPS tracking number for your package online, you will see a message like “Delivered to Parcel Locker” when your delivery arrives.) To get your package out of the parcel locker, you simply need to use the key the mail carrier has left in your mailbox to unlock the parcel locker. The key will have a tag that indicates which locker contains your package. Once you have unlocked the parcel locker and retrieved your package, the key capture system will secure the parcel locker key in place so that it can’t be removed. Only a USPS mail carrier will be able to remove the key with a master key. If you’re still unsure of how parcel lockers work, consult this helpful video.

Salsbury 4C mailbox doors come in four sizes. MB1 doors are 3-1/4” H x 12-3/4” W, MB2 doors are 6-3/4” H x 12-3/4” W, MB3 doors are 10-1/4” H x 12-3/4” W and MB4 doors are 13-3/4” H x 12-3/4” W.

Effective July 2020, the USPS-4C Standard includes a parcel locker requirement based on a 1:5 parcel locker to customer compartment ratio. This means that there should be at least one (1) parcel locker for every five (5) mailbox compartments.

Salsbury 4C Custom Horizontal Mailboxes and parcel lockers are available as recessed mounted, surface mounted, and free standing units in configurations that are one door wide (single column) and two (2) doors wide (double column). Units can be configured with a combination of four (4) mailbox door sizes and five (5) parcel locker door sizes to meet your custom requirements. Click here to view more detailed information about Custom 4C Horizontal Mailboxes. Other customizable options available for all Salsbury 4C mailboxes include custom colors, custom engraved placards and custom engraved doors (regular or black filled).

Salsbury Industries’ 4C Mailbox Configurator will help you determine the optimal number of mailboxes and parcel lockers needed based on your specific requirements. The 4C Mailbox Configurator provides a summary with elevations, rough opening dimensions, sample installation instructions, model numbers, and other helpful information. All 4C horizontal mailbox styles can be configured. To customize your unit, access our 4C mailbox configurator here.