Master Lock Magnum Heavy Duty Padlock 4 Pack Keyed-Alike - Weather

Our review of the Master Lock Magnum M1XQ keyed-alike 4 pack finds it best for anyone needing tough, reliable padlocks for outdoor storage, job boxes, fences and self-storage units. The single biggest reason to buy is the combination of a laminated steel body with stainless and zinc outer components and a Tough-Cut boron-carbide shackle that resists cutting and sawing better than typical hardened steel, so these locks feel purpose-built for exposed, high-risk environments rather than light indoor use.

Key Features

• Laminated steel body: Provides a compact 1-3/4 in wide lock body that balances strength and portability for gates and storage boxes.
• Dual Armor construction: Stainless steel and zinc outer components improve weather resistance for outdoor use and reduce corrosion over time.
• Tough-Cut octagonal shackle: The 5/16 in boron-carbide shackle is 50% harder than hardened steel, offering strong resistance to cutting and sawing.
• Dual ball bearing locking: Adds pry and hammer resistance so the locks hold up better against forced entry attempts.
• Keyed-alike set: Includes four padlocks and two keys, with both keys opening all locks for simplified access control on multiple locks.
• Reinforced bumper: A reinforced body bumper helps prevent scratches and wear when used on metal boxes or chained gates.

Who It's For

These padlocks are ideal for contractors, property owners, and anyone who needs several consistent locks for job site boxes, self-storage units, fences or outdoor sheds. The keyed-alike feature makes it practical when one key must access multiple locks, saving time and reducing the number of keys carried.

Those who need an ultra-large shackle clearance or a very small travel padlock should look elsewhere; the 5/16 in diameter shackle with 1 in length and the 1-3/4 in body make these a medium-size, heavy-duty option rather than an oversized or tiny lock.

Pros & Cons

Pros

• Solid construction and materials deliver clear strength and durability for outdoor use.
• Tough-Cut boron-carbide shackle offers excellent cutting resistance compared with standard hardened steel.
• Keyed-alike convenience across four locks reduces the need for multiple keys.
• Dual ball bearing and 4-pin cylinder improve pick and pry resistance for better security.

Cons

• Some buyers may find the locks too small for larger hasps or bulky chain applications due to the 1 in shackle length.
• Customers reported mixed impressions of material quality even though performance and value are generally praised.

Specifications

Brand	Master Lock (Magnum M1XQ)
Lock body width	1-3/4 in (44 mm)
Shackle diameter	5/16 in (8 mm)
Shackle length	1 in (25 mm)
Shackle material	Tough-Cut octagonal boron-carbide
Lock cylinder	4-pin cylinder with dual ball bearings
Package contents	Four padlocks and two keys, keyed-alike

Our Verdict

The Master Lock Magnum M1XQ 4 pack keyed-alike is a practical, heavy-duty choice for outdoor storage, fences and job sites where cutting and prying resistance matter. It represents good value for buyers who need multiple matching locks and prefer rust-resistant outer components; those requiring larger shackles or very small locks should consider other options.

Frequently Asked Questions

Are these padlocks weather resistant?
Yes, the Dual Armor construction with stainless steel and zinc outer components improves corrosion resistance for outdoor use.

Do the keys open all four locks?
Yes, the set is keyed-alike so both included keys operate all four padlocks.

How secure is the shackle against cutting?
The octagonal Tough-Cut boron-carbide shackle is about 50% harder than hardened steel, giving much better resistance to cutting and sawing.