10 Best Combination Locks 2025 in the United States

The Master Lock 1530DCM is designed primarily for indoor use on lockers and gym cabinets, making it a solid choice if you need a reliable lock for these purposes. It features a sturdy metal body with an anodized aluminum cover and a hardened steel shackle, which provides good resistance against tampering and physical damage. The shackle is 7 mm thick, offering a reasonable level of security for everyday locker use. Its preset three-digit combination is simple and convenient, meaning you won’t need a key and can easily remember your code.

However, this combination cannot be reset, so if you lose the code, you might have trouble accessing your belongings. The lock is compact and lightweight, which makes it easy to carry and handle but also indicates it’s not built for heavy-duty outdoor use. There is no weather resistance, so it’s best kept away from rain or harsh outdoor conditions. The lock comes in assorted colors, adding a bit of personal style but you cannot choose your preferred color.

While it lacks advanced features like a resettable code or weatherproof design, it offers good basic security, ease of use, and durability for indoor locker applications. If you want a simple, dependable lock for school or gym lockers without fussing over keys, this Master Lock model should serve you well.

The Master Lock Gold Outdoor Combination Lock is designed for serious security needs, making it ideal for gates, sheds, and storage units. Constructed with a robust zinc body and a reinforced bumper, it offers significant strength and reliability. Weather resistance is a standout feature, with a shackle seal and covered dials to protect against the elements, ensuring durability in outdoor settings.

The octagonal boron-carbide shackle is exceptionally tough, being 50% harder than hardened steel, which enhances its resistance to cutting and prying. The lock’s dimensions provide a good balance of size and security, with a 3/8 inch thick shackle that fits a variety of applications. Setting and recalling the four-digit combination is straightforward, and the lock is resettable without needing a tool, adding to its ease of use.

The one-directional dial feature is a helpful addition for low-light conditions. However, the lock's weight, nearly 2 pounds for the pack, might be cumbersome for some users. Also, while the combination mechanism is user-friendly, it may not deter determined thieves as much as a keyed lock might. Available in a pack of two, it offers good value for securing multiple items. This lock is best suited for users who need a durable, weather-resistant padlock for outdoor use, and appreciate the convenience of a resettable combination.

The Master Lock Black Combination Padlock 647D is a suitable option for those in need of a secure, portable lock for items like luggage, backpacks, and gym lockers. It boasts a robust metal and steel construction which offers a level of cut resistance, enhancing security against tampering.

The lock's shackle measures 3/16 inches in diameter, providing a decent strength to resist cutting attempts. Additionally, the ability to set a personalized 3-digit combination offers convenience and eliminates the need for carrying a key. The lock lacks explicit weather resistance features, which might limit its durability in outdoor environments.

Its compact size and relatively light weight (2.82 ounces) make it easy to transport and fit into small spaces. The ease of setting and resetting combinations adds flexibility, but it may require careful handling to ensure combinations are not accidentally reset. The customer satisfaction rating of 4.4 out of 5 stars suggests that users generally find it reliable and effective for its intended use cases. Nonetheless, those seeking a lock for harsher conditions or more demanding security needs may want to explore other options with enhanced weather resistance and sturdier shackle thickness.