Salsbury Industries 3507ARU
Salsbury Industries 3507ARU Recessed Mounted Vertical Mailbox
Model: 3507ARU
Product Overview
The Salsbury 3500 Series Vertical Mailboxes are designed for recessed mounting and feature USPS access. These mailboxes are approved for replacement and/or retrofit installations, meeting USPS-STD-4B+ Specifications. They are ideal for use in apartments, condominiums, and commercial buildings, providing secure and organized mail delivery.
Constructed entirely of aluminum, the mailboxes boast a durable powder-coated finish. Individual compartments measure 5-1/2 inches wide, 16-1/4 inches high, and 6-3/4 inches deep. The design includes a fully integrated flanged collar for a clean installation into a rough opening.
Key Features
- USPS Approved: Designed to meet USPS-STD-4B+ Specifications for secure mail delivery.
- Durable Construction: Made entirely of aluminum with a durable powder-coated finish for longevity.
- Secure Access: Each tenant door includes a 5-pin cylinder cam lock with two keys.
- Master Lock Compatibility: Includes a master commercial lock, designed to accept a U.S.P.S. supplied arrow lock or private master lock.
- Versatile Installation: Recessed mounted design fits into a rough opening and is secured through the back or side panels.
- Individual Compartment Size: Each compartment is 5-1/2" W x 16-1/4" H x 6-3/4" D.
Setup and Installation
This Salsbury 3507ARU mailbox is designed for recessed mounting. Proper installation is crucial for security and functionality. For detailed instructions, please refer to the official installation manual provided by Salsbury Industries.
Installation Notes:
- The rough opening required for recessed mounted vertical mailboxes is typically 1-1/2 inches less than the unit's width, 1-1/4 inches less than the unit's height, and equal to the unit's depth.
- The unit fits into the rough opening and is secured using mounting hardware (not included) through the back or side panels.
- A fully integrated flanged collar is included, which fits over the rough opening for a finished appearance.

Image: Recess mounted units fit into a rough opening and are secured with mounting hardware through the back or side panels.
For comprehensive installation steps and safety guidelines, download the official PDF manual: Salsbury Industries Installation Manual (PDF).
Operating Instructions
Operating the Salsbury 3507ARU vertical mailbox is straightforward for both tenants and mail carriers.
Tenant Access
Each individual compartment is equipped with a secure 5-pin cylinder cam lock. To access your mail, insert your key into the lock and turn it to open the door. Retrieve your mail, then close and lock the door securely.

Image: All compartments are for tenant access and include locks with two (2) keys. The carrier access door is for USPS provided master arrow lock.
Mail Carrier Access
The central access door is designed to accept a U.S.P.S. supplied arrow lock or a private master lock. This allows mail carriers to open the entire unit for efficient mail delivery to all compartments. The unit can be displayed in a mail loading position, where all tenant doors tilt forward for easy access by the mail carrier.

Image: Unit displayed in mail loading position.
Optional Features
Optional custom engraved placards are available for individual doors to clearly label compartments. Additionally, matching letter boxes with optional custom engraving can be integrated for outgoing mail or rent collection, if desired.

Image: Door shown with optional custom engraved placard.

Image: Front view of the Salsbury Industries 3507ARU Recessed Mounted Vertical Mailbox.
Product Demonstration Video
Video: This video demonstrates the features and operation of Salsbury Industries Vertical Mailboxes, including tenant access, mail loading position, and optional features like custom engraved placards and outgoing mail slots.
Maintenance
To ensure the longevity and optimal performance of your Salsbury vertical mailbox, regular maintenance is recommended.
- Cleaning: Wipe down the exterior surfaces with a soft, damp cloth and mild soap as needed. Avoid abrasive cleaners or harsh chemicals that could damage the powder-coated finish.
- Locks: Periodically check the cam locks for smooth operation. If a lock becomes stiff, a small amount of graphite lubricant can be applied to the keyhole. Do not use oil-based lubricants.
- Hinges: Ensure all door hinges are free of debris and operate smoothly.
- Security: Regularly inspect the mailbox for any signs of tampering or damage to ensure continued security.
Troubleshooting
Here are some common issues and their potential solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Key does not turn in lock. | Incorrect key; debris in lock; stiff mechanism. | Ensure you are using the correct key. Check for and remove any visible debris. Apply a small amount of graphite lubricant to the keyhole. |
| Door does not close securely. | Obstruction in the compartment; latch mechanism misalignment. | Check inside the compartment for any items blocking the door. Inspect the latch mechanism for proper alignment and function. |
| Mail is not being delivered. | USPS access issue; internal obstruction. | Contact your local postal service to report the issue. Ensure the master access door is functioning correctly for the mail carrier. |
If the issue persists after attempting these solutions, please contact Salsbury Industries customer support.
Specifications
| Attribute | Detail |
|---|---|
| Brand | Salsbury Industries |
| Model Number | 3507ARU |
| Material | Aluminum |
| Color | Aluminum |
| Mounting Type | Recessed Mount |
| Product Dimensions | 40.75"D x 7.5"W x 19"H |
| Item Weight | 10.54 Pounds |
| Access Location | Front |
| Capacity | 9.45 Liters |
| Included Security Features | Lockable |
| Included Components | Locks with 2 keys |
| Individual Compartment Size | 5-1/2" W x 16-1/4" H x 6-3/4" D |
Warranty and Support
This Salsbury Industries mailbox comes with a 3-year limited warranty. For warranty claims, technical support, or any inquiries regarding your product, please contact Salsbury Industries directly.
Salsbury Industries is an ISO 9001:2008 certified company, committed to quality manufacturing since 1936.
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