Master Lock Wall Mount Lock Box

The Master Lock Wall Mount Lock Box (5401D) is a heavy-gauge steel key storage solution that combines a 4-digit resettable combination with wall-mount security, weighing approximately 1.2 lbs. With a 4.5-star average across 1,600 reviews, it delivers reliable secure access for contractors managing job sites and property managers handling multiple rentals.

The lock box provides an internal cavity of approximately 3.25” x 2.25” x 1.25”, holding 7-8 standard house keys. The temperature rating reaches down to -20°C on outdoor models — critical for Montana’s temperature extremes.

Weather Resistance and Installation Specs

Montana contractors need storage that survives temperature swings from summer heat to winter deep freezes. The Master Lock wall mount delivers with powder-coated finish for corrosion resistance and outdoor-rated models handling -20°C to +50°C temperature ranges. The shutter door protects combination dials from weather, dirt, and grime — essential when you’re mounting these on construction site trailers or exterior walls.

Installation demands precision but delivers permanent security: mount at 48-54 inches height, mark 4 holes using the box as a template, drill pilot holes (1/4” for wood, 3/16” for masonry), then secure with provided #8 screws and anchors. The wall-mount design eliminates the vulnerability of portable lock boxes that can walk off a job site.

Specification	Value
Body Material	Heavy-gauge steel / Zinc body
External Dimensions	3-1/4” W x 5.4” H x 5” D
Internal Cavity	3.25” x 2.25” x 1.25”
Weight	1.2 lbs (0.55 kg)
Temperature Rating	-10°C to +50°C (standard), -20°C outdoor models
Key Capacity	7-8 standard house keys

Real-World Capacity and Applications

The large internal cavity prevents jamming even when holding multiple keys. At 3.25” x 2.25” x 1.25” internal dimensions, the box handles 7-8 standard house keys comfortably. It’s compatible with standard house keys, car keys without bulky fobs, and access cards. Some models include an internal key-return strap to keep keys organized — preventing the jumbled mess that leads to fumbling in the cold.

Construction and facility maintenance crews use these for shared contractor access, while property managers mount them for rental and Airbnb properties. Commercial applications include HVAC rooms, electrical closets, and mailrooms. The permanent mount means it stays where you install it, unlike shackle-style boxes that depend on finding something sturdy to attach to.

Warranty and Long-Term Performance

Master Lock backs the lock mechanism with a Limited Lifetime Warranty and provides a 5-Year Warranty on the housing and finish. Coverage handles defects in materials and workmanship, requires proof of purchase, and excludes normal wear on dials or finish.

Users report generally positive experiences, though common minor complaints include dials feeling stiff over time or hinges showing slight play after heavy use. Review ratings break down as: Home Depot 4.7 stars (93 reviews), Lowe’s 4.5 stars (1,430 reviews), and Amazon 4.4 stars (70 reviews).

For Montana’s combination of weather extremes and the need for reliable multi-user access, this wall-mount design delivers what portable options can’t — permanent placement that survives the elements.

Frequently Asked Questions

Q: What’s the actual internal space for keys?

The internal cavity measures approximately 3.25” x 2.25” x 1.25”, which holds 7-8 standard house keys. The box handles standard house keys, car keys without bulky fobs, and access cards. Modern vehicle fobs or large commercial keys may limit capacity.

Q: How cold can these handle in Montana winters?

Standard models operate from -10°C to +50°C, while outdoor-rated models extend down to -20°C. That covers typical Montana winter conditions, though extreme cold snaps below -4°F may stiffen the dial mechanism temporarily.

Q: What mounting hardware comes with it?

The lock box includes #8 screws and anchors in the mounting hardware kit. You’ll need to drill pilot holes — 1/4 inch for wood studs or 3/16 inch for masonry anchors.

Q: Can the combination be changed after installation?

Yes, it features a 4-digit resettable combination dial. To set a new combination, move the internal reset lever, dial the new code, then return the lever. Always test the new code before closing the door with keys inside.

Q: What’s covered under warranty?

Master Lock backs the lock mechanism with a Limited Lifetime Warranty and provides a 5-Year Warranty on the housing and finish. Coverage handles defects in materials and workmanship. Coverage is non-transferable, requires proof of purchase, and excludes normal wear on dials or finish.