Product Overview
The Master Lock 5401EC Set Your Own Combination Wall Mount Lock Box is designed for secure storage of keys, offering keyless convenience and enhanced security. Its durable metal body and weather-resistant features make it suitable for both indoor and outdoor use. This lock box is ideal for homes, businesses, and rental properties, allowing authorized individuals to access keys when needed.

Image: Master Lock 5401EC Wall Mount Lock Box, showing its compact design and combination dials.
Key Features
- Large Capacity: Securely stores up to five standard house keys.
- Set Your Own Combination: Features a 4-digit resettable combination for personalized access.
- Durable Construction: Metal body ensures durability for long-lasting use.
- Weather Protection: Shutter door protects combination dials from weather, dirt, and grime.
- Wall Mount Design: Designed for permanent installation on a wall or fixed object.
- Vinyl Coated Shackle: This feature is typically found on shackle-style lock boxes, but the 5401EC is a wall-mount model. The vinyl coating on shackle models prevents scratching of surfaces.

Image: Diagram highlighting key features of the Master Lock 5401EC, including wall mount design, 4-digit combination, weather protection cover, and storage compartment for keys.
Setup and Installation
The Master Lock 5401EC is designed for permanent wall-mount installation. Follow these steps for secure setup:
- Choose Location: Select a suitable, secure location on a wall or fixed object for mounting.
- Mark Drill Holes: Open the lock box to expose the mounting holes. Use a pencil to mark the positions of the four mounting holes on the chosen surface.
- Drill Pilot Holes: Drill pilot holes at the marked locations. Ensure the drill bit size is appropriate for the provided screws and your wall material.
- Mount the Lock Box: Align the lock box with the pilot holes and secure it using the provided screws. For masonry or concrete, use appropriate wall anchors (not included) in addition to the screws.
- Verify Security: Ensure the lock box is firmly attached to the wall and cannot be easily removed.

Image: The Master Lock 5401EC mounted on two different wall surfaces, demonstrating its permanent installation.
Video: Official Master Lock video demonstrating the setup and combination setting for the 5400D/5401D series lock boxes.
Operating Instructions
Setting Your Combination
The lock box comes with a default combination of 0-0-0-0. To set your personalized 4-digit combination:
- Open the Lock Box: Enter the current combination (default is 0-0-0-0) and pull down the release button to open the lock box door.
- Locate Reset Lever: Inside the lock box, on the back of the door, locate the reset lever.
- Move Reset Lever: Push the reset lever from position 'A' (up) to position 'B' (down and to the left).
- Set New Combination: With the door open, rotate the combination dials to your desired 4-digit code. Ensure the numbers are clearly aligned.
- Return Reset Lever: Push the reset lever back to position 'A' (up and to the right).
- Close and Scramble: Close the lock box door and scramble the dials to secure your new combination.

Image: A four-step visual guide demonstrating how to set a new combination on the Master Lock 5401EC, including opening the box, moving the reset lever, rotating dials, and returning the lever.
Accessing Keys
- Enter Combination: Rotate the dials to your set 4-digit combination.
- Open Door: Pull down the release button located below the dials. The door will open, providing access to the keys inside.
- Close and Scramble: After retrieving or placing keys, close the door firmly and scramble the dials to lock the box and conceal your combination.

Image: Illustration showing the secure storage capacity of the Master Lock 5401EC for up to five house keys, contrasting with insecure key hiding spots.
Maintenance
To ensure the longevity and optimal performance of your Master Lock 5401EC lock box:
- Regular Cleaning: Periodically wipe down the exterior with a soft, damp cloth to remove dirt and grime.
- Lubrication: If the dials become stiff, apply a small amount of silicone-based lubricant to the moving parts. Avoid oil-based lubricants as they can attract dust.
- Inspect for Damage: Regularly check the lock box for any signs of physical damage or wear.
- Weather Protection: Keep the shutter door closed over the combination dials when not in use to protect them from harsh weather conditions.
Troubleshooting
If you encounter issues with your Master Lock 5401EC:
- Combination Dials Stuck: Ensure the dials are clean and free of debris. Apply lubricant if necessary.
- Door Not Opening: Double-check that the correct combination is entered and the release button is fully depressed.
- Forgotten Combination: If you forget your combination, Master Lock does not provide a master key or override code for set-your-own combination locks. It is crucial to record your combination in a secure, memorable place.
- Locking Mechanism Failure: In rare cases of mechanical failure, refer to the warranty information for repair or replacement options.
Specifications
| Feature | Detail |
|---|---|
| Brand | Master Lock |
| Model Name | 5401D |
| Part Number | 5401EC |
| Lock Type | Combination Lock |
| Special Feature | Passcode Unlock |
| Material | Metal |
| Color | Black |
| Mounting Type | Wall Mount |
| Key Capacity | 5 Keys |
| Exterior Dimensions (H x W x D) | 4-3/4 inch (12 cm) x 3-1/4 inch (8.3 cm) x 1-1/2 inch (3.8 cm) |
| Interior Dimensions (H x W x D) | 3-1/4 inch (8.3 cm) x 2-1/4 inch (5.7 cm) x 1 inch (2.5 cm) |
| Item Weight | 1.09 pounds (494 Grams) |

Image: Detailed diagram showing the exterior and interior dimensions of the Master Lock 5401EC, including key capacity.
Warranty and Support
The Master Lock 5401EC Set Your Own Combination Wall Mount Lock Box comes with a Limited Lifetime Warranty. This warranty provides peace of mind from a trusted brand. For warranty claims or technical support, please contact Master Lock customer service directly. Ensure the product has not been modified or tampered with, as this may affect warranty coverage.
For further assistance, visit the official Master Lock website or contact their customer support.





