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SKU: WL-CBU-8-SDBM  |  View All 8 Door CBU Mailboxes

8 Door CBU Mailbox - Sandstone

(View all from Cluster Box Units)
& Free Shipping!
List Price:
You Save:

$267.22 (20%)

Volume Discount Pricing
2 - 5$1,036.50
6+ $1,011.67
USPS Approved
Select Option

Will the USPS be delivering to this mailbox?

Door ID Layout

Optional Anchor Bolts

Door Identification

According to manufacturer:
Standard - Usually ships in 3 business days
Custom - Usually ships in 1 to 2 weeks
Ships directly from the factory floor to ensure the quickest available delivery.
16 Door CBU

USPS Approved and Ready

USPS Approved Mailbox

CBU’s are Pre-approved

Pre-approved by the USPS, cluster mailboxes are considered the industry standard when it comes to outdoor, centralized mail delivery.

Installation Location

If you are involved in a new construction development, you have probably already consulted or will consult with your local postmaster regarding the placement (location) of your CBU. If not, we recommend it.

Master Lock Installation

After installing the CBU, follow-up with your local post office and the USPS will install their master lock for the main access door. Note: the USPS provides the master lock and only they have the keys to it.

16 Door CBU

Five Year Warranty

5 Year Product Warranty

All cluster box units (CBUs) sold on come with a Five (5) Year Warranty.

Florence Manufacturing provides a five (5) year Warranty on its products from the date of purchase from an Authorized Florence Dealer (i.e., For more info, refer to the Auth-Florence Warranty sheet.

Likewise, Salsbury Industries covers defects in material and workmanship if reported in writing to them within five (5) years of the delivery date for CBUs. Refer to the Salsbury Warranty sheet for more details.

16 Door CBU

New USPS Standard

USPS Approved Mailbox

Obsolete: NDCBUs are no longer permitted for replacement or new installations

USPS Approved Mailbox

New CBUs accommodate both mail and packages while providing greater security.

Developed and approved by the USPS in 2005, the new cluster box unit specification (right image) became the standard for all manufacturers and replaces both the outdated Neighborhood Delivery Collection Box Unit (NDCBU) and the “E” series CBU.

While the original NDCBU introduced convenience for residents and letter carriers alike, it is no longer permitted for replacement or new installations. These outdated units fall into disrepair as they age and are, in many cases, quite dilapidated. The newer 2005 specifications boast a thoroughly tested design that provides better security and durability over time.

16 Door CBU

CBU High-Security Standards

BM Lock

All CBUs are designed to deter mail theft attempts using the following features:

  • All units are made of high grade, industrial, aircraft-quality aluminum.
  • On the outside of the unit, there are no removable fasteners. This prevents tampering.
  • The cabinet is made using high-precision robotic welding.
  • The CBU uses a sloped roof for water run-off and a drip-edge in the front to protect the individual slots from rainwater.

    Drip Edge
  • The master-loading door has a vertical bridge with an overlap that eliminates the gap between the two master-loading doors -- in other words, there are no pry-points on the unit.

    No Pry Point
  • Heavy-duty, zinc-plated cam locks are tamper proof and latch through the aluminum frame for added security.

    Cam Lock
  • The outgoing mail slot uses a sloping hood to prevent a person from reaching in with their hand.

    Sloped Hood
  • The aluminum, anti-fish comb deters thieves from reaching into the slot with coat hangers or other prying tools.

    Anti Fish Comb
16 Door CBU

Don’t need USPS delivery? Convert to private use.


If you don’t need USPS delivery and you intend to use the CBU for private use (where a company or organization will need access to open the master door for delivery), then you need the Postal to Private Conversion Kit, which can be purchased via the dropdown options section of any CBU.

Under the Option labeled “Will the USPS be delivering to this mailbox?”, select “No, this box is for private use…”. Private delivery CBUs are typical where mail delivery is handled by private distribution within the company or organization.

16 Door CBU

Lead Times

BM Lock
  • All orders ship directly from the factory floor to ensure the quickest available delivery.
  • takes delivery dates and deadlines seriously. We update our lead time projections frequently in an effort to provide you with the most accurate projections. Currently, we estimate the following lead time:

    Standard - Usually ships in 3 business days
    Custom - Usually ships in 1 to 2 weeks

  • When you select standard numbering (e.g, 1-8, 1P & 2P) for the CBU doors, the mailbox usually ships in 1 to 3 weeks.
  • When you select custom number plates or engraving, the CBU will usually ship in 3 weeks.
16 Door CBU

Customize Your Door ID Layout

8 Door Custom Layout
  • Custom Layouts can be selected from the dropdown option labeled “Door ID Layout”.
  • You can customize the layout to suit your needs.
  • To ensure a custom layout is processed correctly, we ask that you complete this layout form after completing your purchase.
16 Door CBU

Door ID Options

Door ID Options

Decals: All CBUs come standard with silver adhesive decals 1.5 inches high by 1.75 inches wide. Black lettering can contain up to five characters per decal.

Engraving: Custom engraving utilizes the USPS Standard US Block font with up to 12 characters per line. This ¾ inch high engraving may be created with or without one of two color fill options (white or black).

See this info sheet for more details on door ID options.

Note: CBUs selected with custom decals or engraving usually ship in three (3) weeks. We cannot rush orders for units purchased with custom numbering.

16 Door CBU

Optional Anchor Bolts

Optional Anchor Bolts

If you need anchor bolts for your CBU installation, add them from the dropdown options above the Add to Cart button.*

  • The kit includes everything required to mount the CBU pedestal to newly poured concrete.
  • Bolt specs:
  • Hardware kit includes four (4) stainless steel anchor bolts and four (4) standard nuts.

Vandal proof nuts can be purchased in addition to the standard nuts for added security.

16 Door CBU

Technical Specifications (Dimensions, etc.)


The top of the cluster mailbox (the crown) is 30.5 inches wide by 18.5 inches deep. The cluster box itself measures 30.5 inches wide by 16.75 inches deep by 34.25 inches high. Including the pedestal, the total unit height is 62 inches. For more detailed specifications, please view this Technical Drawing.

16 Door CBU

Color Options

The Auth-Florence 8 Door CBU is offered in four color variations while the Salsbury CBU is offered in six color variations. (Note: all green and white CBUs purchased on are manufactured by Salsbury Industries.)

Sandstone is the most popular color option and is considered the new architectural standard. All finishes are powder-coated and corrosion-resistant. If you need to purchase a different color, you can view our selection of variations on the 8 Door CBU Category Page.

16 Door CBU

Design and Other Specifications

CBU Design and Specs

The 8-Door CBU includes two (2) fully integrated parcel lockers and a matching pedestal. One additional compartment is labeled "Outgoing Mail" and includes a weather protection flap and an 12 in. W x 3 in. H mail slot.

The CBU also features individually numbered mail compartments and a mail carrier access door for USPS provided master arrow lock.The unit itself is constructed of high-grade, heavy-duty, aircraft aluminum while the hardware is constructed of stainless steel. All CBUs on are manufactured here in the USA.

Cluster Mailbox Overview
Cluster Mailbox Master Door Open
16 Door CBU

Wide Tenant Boxes Accommodate Larger Envelopes and Magazines

Wide Box

Shown above: the 8 Door CBU Tenant Box (3 in. high)

Wide Box

Shown above: the 13 Door CBU Tenant Box (4 - ¾ in. high)

The Cluster Box Units technical specification is what is known as a 4C Horizontal Mailbox, which is the current USPS Standard for centralized mail delivery. Under 4C regulations, the tenant boxes are wider so that all mail, including larger envelopes and magazines, can be delivered flat without any folding. There is also enough room in each tenant box for small-sized parcels.

16 Door CBU

Integrated Parcel Lockers

Integrated Parcel Lockers

Among the many benefits of the CBU are the integrated parcel lockers for package delivery. If you receive a parcel, the Postal Carrier will conveniently leave the key to the parcel locker in your mailbox so that you can retrieve your package.

Security Tip: Once you enter the key and open the parcel locker the key cannot be removed. This is by design so that only the postal carrier can remove the parcel locker key. See video explanation below:

16 Door CBU

The matching CBU Pedestal - Easy Installation

The matching CBU Pedestal - Easy Installation

*Disclaimer: the CBU anchor bolts, nuts, and/or vandal proof nuts for pedestal installation are specifically for installations where new concrete is being poured. Actual measurements between bolts should be confirmed prior to installation. is not liable for faulty installation due to inaccurate measurements.

All cluster mailboxes include an easy-to-install pedestal. The CBU Pedestal is constructed of heavy-duty, corrosion-resistant aluminum. Cluster mailboxes can be mounted on the included pedestal (or a base of your choice provided it meets USPS height specifications).

The pedestal comes with the needed stainless steel hardware for 1) mounting the pedestal to the cluster box and 2) mounting the unit to the concrete slab (using standard bolts). If you need to purchase anchor bolts for installation prior to pouring the concrete slab,* you can add these via the dropdown options above the Add to Cart button.

The CBU concrete pad spec sheet for installing the pedestal is below.

CBU concrete

For more details on pedestal installation, see How to Install Your CBU.

16 Door CBU

What is included with the CBU?

What is included with the CBU?

The CBU cabinet and pedestal are packaged separately. Below is a list of components and hardware you will receive in each package.

Pedestal Package:
  • Template - guide to locate the pedestal base anchors
  • Rubber Pad - installed between the ground and the pedestal base
  • Pedestal - fully assembled
Cabinet Package:
  • CBU mailboxes and parcel lockers in protective cabinet
  • Hardware kit in plastic bag (shipped inside the CBU compartment) that includes:
    • Pedestal hardware
    • Tenant keys
    • Parcel keys and tags
    • Installation manual
  • Cleaning instructions
  • Parcel door hardware (in a plastic bag inside the cabinet) - (2) McGard and (3) two-way screws; (4) Arrow Lock nuts; and panel lock covers attached with temporary plastic fastener
16 Door CBU

Heavy-Duty Cam Lock

Heavy Duty Cam Lock

Every tenant door on the Cluster Box Unit features a stainless steel heavy-duty five-pin cylinder cam lock with a dust and rain shield, along with three (3) keys. This simple yet effective locking mechanism provides the needed security to keep your mail safe until you retrieve it.

If you ever need to replace one of the cam locks, the process is very straightforward. Watch the video below to see how you can replace one of these locks within minutes.

16 Door CBU

Opening the Master Doors & Locating Your Keys

  • Cluster Box Units (CBUs) are accessed from the front through two (2) easy-to-open master door panels.
  • Watch the video to see how to open the master doors and locate your keys (hint: the keys are taped to the inside of your box and are usually inside one of the parcel lockers).

See the corresponding video for more details.

16 Door CBU

Who has a USPS License to manufacture CBUs?

Who has a USPS License to manufacture CBUs?

Auth-Florence was founded in 1934 while Salsbury Industries began in 1936. Both have the exclusive license from the USPS to manufacture Cluster Box Units (CBUs) in the USA. CBUs from both manufacturers are relatively identical in both design and quality.

Where are they different?
  • Pricing - Salsbury Industries CBUs tend to have higher prices.
  • Lead times - Florence CBUs typically ship in 1-3 weeks while Salsbury CBUs tend to ship quicker in about 3-5 business days.
  • Finishes - Florence offers CBUs in four architectural finishes: Sandstone, Postal Grey, Bronze, and Black. Salsbury offers these four finishes as well as White and Green.
  • Options - While Auth-Florence CBUs can be purchased without pedestals (reducing the price), the Salsbury CBU can only be purchased with the included pedestal.

While pricing, lead time, finishes, and options are similar, they are not the same between the factories.

For example, sometimes Salsbury ships CBUs faster than Florence (or vice versa). Also, the manufacturer controls their own pricing, so often one brand may cost more than the other.

BudgetMailboxes has you covered. We keep it simple. We sell you the CBU from the manufacturer that is the cheapest and we give you transparent, up-to-date lead times once your order is placed.

16 Door CBU

What types of customers purchase Cluster Mailboxes?

16 Door CBU

Over the past nine years, we have serviced all types of properties. CBUs are commonly installed at the following:

  • Apartment Complexes
  • Homeowners Associations
  • Municipalities
  • Universities
  • Commercial Developments
  • Small Businesses

We are proud to supply CBUs to some of the nation’s most respected cities and companies. Here are some of our recent notable customers.

16 Door CBU

CBUs - A Comprehensive Comparison

Florence & Salsbury USPS Approved Cluster Box Units

USPS Approved CBUPre-configured units include built-in parcel lockers and outgoing mail collection for added convenience to be used alone or in large groupings to accommodate every project need.

Below we list each pre-configured model number along with its associated manufacturer. Refer to the table below for detailed specs.

  • 1570-8XX


  • 1570-12XX


  • 1570-16XX


  • 1570-13XX


  • 1570-4T5XX


  • 1570-8T6XX


Model #Installed HeightInstalled WidthInstalled DepthPedestal HeightWeight (LBS)Tenant Compartment DimensionsMailbox CompartmentsParcel Lockers
1570-862 in.30 - ½ in.18 in.28 - ½ in.1443 in. H x 12 in. W x 15 in. D82
1570-1262 in.30 - ½ in.18 in.28 - ½ in.1443 in. H x 12 in. W x 15 in. D121
1570-1662 in.30 - ½ in.18 in.14 - ½ in.1753 in. H x 12 in. W x 15 in. D162
1570-1362 in.30 - ½ in.18 in.14 - ½ in.1674 - ¾ in. H x 12 in. W x 15 in. D131
1570-4T562 in.30 - ½ in.18 in.28 - ½ in.1456 - ½ in. H x 12 in. W x 15 in. D42
1570-8T662 in.30 - ½ in.18 in.14 - ½ in.1763 in. H x 12 in. W x 15 in. D84
330862 - ¾ in.30 - ½ in.18 in.28 - ½ in.1553 in. H x 12 in. W x 15 in. D82
331262 - ¾ in.30 - ½ in.18 in.28 - ½ in.1553 in. H x 12 in. W x 15 in. D121
331662 - ¾ in.30 - ½ in.18 in.14 - ½ in.1753 in. H x 12 in. W x 15 in. D162
331362 - ¾ in.30 - ½ in.18 in.14 - ½ in.1654 - ¾ in. H x 12 in. W x 15 in. D131
16 Door CBU

Outdoor Parcel Lockers - A Comprehensive Comparison

Florence & Salsbury USPS Approved Outdoor Parcel Lockers

Salsbury USPS ApprovedIndustry unique package delivery systems with key trapping locks can be used alone or with your CBU installation for better convenience. Below we list the available parcel lockers by both Auth-Florence and Salsbury Industries.

Auth-Florence USPS Approved Parcel Lockers

  • 1590-T1SD
  • 1590-T1DB
  • 1590-T1PG
  • 1590-T1BK
  • 1590-T2SD
  • 1590-T2BK
  • 1590-T2PG
  • 1590-T2DB

Salsbury Industries USPS Approved Parcel Lockers

  • USPS Approved Parcel Lockers
  • USPS Approved Parcel Lockers
  • USPS Approved Parcel Lockers
  • USPS Approved Parcel Lockers
  • USPS Approved Parcel Lockers
  • USPS Approved Parcel Lockers

Key Manufacturer Notes:

  • Auth-Florence is the Sole Source Supplier to the USPS, meaning they are the only manufacturer authorized to supply cluster box units, outdoor parcel lockers, replacement pedestals, and parts directly to the USPS.
  • Auth-Florence is also the only company to manufacture the 1590-T2 Parcel Locker with Four (4) instead of Two (2) Parcel Locker doors.
  • Salsbury Industries manufactures the 3302 Parcel Locker, which is USPS Approved for outdoor parcel delivery.
  • Private delivery models are also available for both manufacturers.
ManufacturerModel #Installed HeightInstalled WidthInstalled DepthPedestal HeightWeight (LBS)Parcel Compartment DimensionsParcel Lockers
Auth-Florence1590-T1XX62 in.16 in.18 in.14 - ½ in.10019 - ⅝ in. H x 12 in. W x 15 in. D2
Auth-Florence1590-T2XX62 in.30 - ½ in.18 in.14 - ½ in.13919 - ⅝ in. H x 12 in. W x 15 in. D4
Salsbury Ind.3302XXX62 in.16 in.18 in.14 - ½ in.10019 - ⅝ in. H x 12 in. W x 15 in. D2
Note: for Auth-Florence, exchange “XX” in Model #s above for two digit color references: Black (BK), Dark Bronze (DB), Sandstone (SD), Postal Grey (PG). For Salsbury Industries, exchange the “XXX” for these color references: Sandstone (SAN), Black (BLK), Bronze (BRZ), Grey (GRY), Green (GRN), White (WHT).
16 Door CBU

Decorative Accessories - Comprehensive Comparison

Vogue™ Decorative Cluster Mailbox Accessories

These fashionable, snap-together toppers and pedestals put the final touch on your neighborhood or office cluster mailboxes. Choose from either the Classic or Traditional Styles below. Click the image to view the decorative configuration of your choice.

Note: These accessories are USPS approved.

Regency™ Decorative Cluster Mailbox Accessories

Compare the Salsbury Regency CBU to the Florence Traditional Style shown above. Click on an image below to view more details on a specific configuration. The table below breaks down each decorative CBU’s specs.

Model #Installed HeightInstalled WidthInstalled DepthWeight (LBS)Tenant Compartment DimensionsMailbox CompartmentsParcel Lockers
1570-8V65 - ⅛ in.33 - ⅞ in.21 - ⅜ in.1823 in. H x 12 in. W x 15 in. D82
1570-12V65 - ⅛ in.33 - ⅞ in.21 - ⅜ in.1823 in. H x 12 in. W x 15 in. D121
1570-16V65 - ⅛ in.33 - ⅞ in.21 - ⅜ in.2063 in. H x 12 in. W x 15 in. D162
1570-13V65 - ⅛ in.33 - ⅞ in.21 - ⅜ in.1984.75 in. H x 12 in. W x 15 in. D131
1570-4T5V65 - ⅛ in.33 - ⅞ in.21 - ⅜ in.1836.5 in. H x 12 in. W x 15 in. D42
1570-8T6V65 - ⅛ in.33 - ⅞ in.21 - ⅜ in.2073 in. H x 12 in. W x 15 in. D.84
1590-T1V65 - ⅛ in.19 - ⅝ in.21 - ⅜ in.124N/A02
1590-T2V65 - ⅛ in.33 - ⅞ in.21 - ⅜ in.182N/A04
1570-8V271 - ⅜ in.31 - ⅝ in.18 - ½ in.1773 in. H x 12 in. W x 15 in. D.82
1570-12V271 - ⅛ in.31 - ⅝ in.18 - ½ in.1773 in. H x 12 in. W x 15 in. D.121
1570-16V271 - ⅜ in.31 - ⅝ in.18 - ½ in.2033 in. H x 12 in. W x 15 in. D.162
1570-13V271 - ⅜ in.31 - ⅝ in.18 - ½ in.1954.75 in. H x 12 in. W x 15 in. D131
1570-4T5V271 - ⅛ in.31 - ⅝ in.18 - ½ in.1786.5 in. H x 12 in. W x 15 in. D42
1570-8T6V271 - ⅜ in.31 - ⅝ in.18 - ½ in.2043 in. H x 12 in. W x 15 in. D.84
1590-T1V271 - ⅜ in.14 - ½ in.18 - ½ in.119N/A02
1590-T2V271 - ⅜ in.31 - ⅝ in.18 - ½ in.178N/A04
3308R71 - ¾ in.31 in.18 - ½ in.1903 in. H x 12 in. W x 15 in. D.82
3312R71 - ¾ in.31 in.18 - ½ in.1903 in. H x 12 in. W x 15 in. D.121
3316R71 - ¾ in.31 in.18 - ½ in.2153 in. H x 12 in. W x 15 in. D.162
3313R71 - ¾ in.31 in.18 - ½ in.2054.75 in. H x 12 in. W x 15 in. D131
16 Door CBU

How to Install Your CBU

To assist with the installation process we have the CBU Installation Instructions PDF and even a video walking you through the process. We also strongly recommend you review the Concrete Foundation Spec Sheet for more information. If you have more questions, see our CBU Installation page here or call us at (866) 707-0008.

16 Door CBU

Benefits of the CBU

Benefits of the Cluster Mailbox

The benefits of centralized mail delivery:

1. Value - It costs less to install per resident than individual curbside mailboxes. Also, mail delivery can often begin even before residences are occupied.

2. Community - CBUs can help build stronger neighbor relationships and trust as residents meet and talk while retrieving their mail.

3. Safety - Highly visible centralized mail centers are safer than isolated delivery locations for residents and help provide greater protection from mail theft and mailbox vandalism.

16 Door CBU
For Your Reference:

OUR SKU is Cluster Box Units CBU-8-SD

This item is also sometimes listed under the following manufacturer numbers:
WL-CBU-8-SDBM, 3308SAN, 1570-8AF, 1570-8SP, 1570-8SDAF

Dimensions & Weight
Ship Weight:
8 Door CBU Mailbox - Sandstone
62 in. H x 30-1/2 in. W x 17-7/8 in. D
8 Standard Compartments:
3-1/4 in. H x 12-7/8 in. W x 16-3/4 in. D
1 Outgoing Mail Compartment:
3-1/4 in. H x 12-7/8 in.
145.00 lbs
General Category:
Cluster Mailbox
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  • Or if there is any other feedback you would like to provide? Please contact us.
Have a question about this product?
Frequently Asked Questions
Question: Does it have a swivel pedestal option?
Answer: No. The box is serviced and mail is retrieved from the front.

Question: How many keys come with unit?
Answer: There are 3 keys for each tenant door.

Question: Our community is gated so locks on individual boxes are not essential or maybe even desirable. Can the boxes be left unlocked? Answer: The tenant doors come with tenant door locks pre-installed and thumb latches are not offered as an alternative. That is not to say that a customization isn't possible - email or call us if you wish to pursue a potential customization.

Question: What is the shipping cost for 92109?
Answer: Shipping is free for this item.

Question: What is "proper" door ID text? I would prefer simply "1" through "8"
Answer: 1-8 is acceptable.

Question: Can any locksmith duplicate a key?
Answer: You must purchase blank keys from the manufacturer to have them cut correctly.

8 Door CBU Mailbox - Sandstone
Shipping Information:

Shipping Estimate:

Standard - Usually ships in 3 business days
Custom - Usually ships in 1 to 2 weeks

Stock Status:

In Stock

Ships to:


Ship Method:

FedEx/UPS (Learn More)

Shipping Policy:

Return Policy:

Return Instructions:

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We value our customer's time; because of this, we are committed to the easiest ordering process imaginable. As a result, past customers love our prompt service and delivery, our expertise, and easy checkout process.

Even though we are known for easy ordering, we're constantly working towards creating an even easier checkout process that allows you to save more time and feel more confident in your buying decision.

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