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When it comes to securing your personal best lock for your storage unit, more often than not, it’s the unsung hero – the lock – that stands between your possessions and potential theft. In a sea of options, from traditional padlocks to cutting-edge smart locks, how do you ensure you’ve chosen the best one? Let’s dive deep into the labyrinth of storage unit security with the ultimate guide to picking the most suitable lock to safeguard your belongings.

Understanding Different Types of Locks

Before you make your selection, it’s crucial to understand the pros and cons of each type of lock. The most popular locks for storage units are listed here in detail.



  • conventional and having a strong track record.
  • versatile and frequently applied to security chains.
  • offered in a range of sizes and levels of security.


  • Can be relatively easy to cut through.
  • Rust and wear may impact longevity.

Disc Locks


  • Resistant to most break-in methods.
  • Not susceptible to shimming like padlocks.
  • Durable and weather-resistant.


  • High-quality disc locks can be pricier.
  • Size may limit what units they can fit.

Cylinder Locks


  • Sit flush against the door, making it hard to tamper with.
  • Difficult to pick.
  • Standard for many self-storage facilities.


  • Can break if the storage unit door is forced open.
  • More difficult to replace than other locks.

Smart Locks


  • Many offer keyless entry options for convenience.
  • Tracks who opens and closes the unit and when.
  • Can be integrated with home security systems for added peace of mind.


  • Typically more expensive than traditional locks.
  • Reliance on technology can mean a higher chance of malfunctions.

5 Best Lock for Your Storage Unit

Product Name

Special Features


Item Weight

Check Price

BRINKS - 70mm Keyed Discus Padlock

Cut Resistant

‎Stainless Steel

‎8 ounces

Check Price

Master Lock Magnum Heavy Duty Outdoor Padlock with Key

laminated steel lock body with weather resistant cover 

‎Alloy Steel

‎3.2 Ounces

Check Price

H&S High Security Padlock with Key - 60mm Pad Lock & 5 Keys

‎Heavy Duty

‎Alloy Steel

‎9.9 Ounces

Check Price

BRINKS 173-80051 Stainless Steel Resettable Combination Discus Padlock


‎Stainless Steel

‎0.7 Pounds

Check Price

Puroma 2 Pack 2.6 Inch Long Shackle Combination Lock

Weatherproof, ‎Resettable 4-Digit Combination, Premium Material

‎Carbon Steel

‎9.6 ounces

Check Price

01. BRINKS – 70mm Commercial Stainless Steel Keyed Discus Padlock

Introducing the BRINKS 70mm Commercial Stainless Steel Keyed Discus Padlock – a top solution to protect your valuables with Brink’s trusted reliability. Engineered for high-performance security, this padlock offers peace of mind with its innovative design and durable materials. Perfect for securing storage lockers, truck work boxes, or construction site storage.

Features and Specifications:

  • High-Performance Durability: Crafted from premium stainless steel, the 70mm body of the BRINKS padlock is designed to withstand harsh conditions and resist cutting, ensuring your possessions remain safe under the toughest circumstances.
  • Advanced Cut Resistance: The stainless steel shackle stands at the forefront of security technology with an astounding cut strength of up to 8100 lbs. This heavy-duty discus lock is designed to offer superior protection against attempted breaches.
  • Enhanced Security Features: This lock has increased resistance against picks and prys thanks to its four-pin brass tumbler cylinder. Its round shielded design minimizes shackle exposure, making it nearly impossible for thieves to tamper with.
  • Scratch and Ding Prevention: The full-radius rubber bumper is meticulously designed to protect against scratches and dings, ensuring your padlock remains in pristine condition while guarding your belongings.
  • The Brink’s Legacy: Being a leader in the world of security-related goods and services, the BRINKS brand ensures superior security products. Trust in a brand that millions rely on to keep their valuables secure.


  • Unmatched Security.
  • Patented Design.
  • Trusted Brand.
  • Long-Lasting Durability.
  • Versatile Use.


  • Single Lock Mechanism.
  • Size & Weight.
  • Price Point.

02. Master Lock Magnum Heavy Duty Outdoor Padlock

Presenting the Master Lock Magnum Heavy Duty Outdoor Padlock—a sturdy answer to all of your outdoor locking requirements. Master Lock, a trusted name in security, sets the bar high with this padlock. Secure storage units, fences, job boxes, or locker rooms with unmatched security and durability.

Features and Specifications:

  • Outdoor-Ready Design: The Magnum Heavy Duty Outdoor Padlock is specially crafted for outdoor use. It combines a heavy-duty laminated steel lock body with a weather-resistant cover. Even in inclement weather, the padlock’s dual armor construction guarantees its durability and functionality.
  • Tough-Cut Octagonal Boron-Carbide Shackle: At the heart of its security features is the Tough-Cut octagonal shackle made from boron-carbide, a material known for its extreme hardness. The padlock is nearly uncuttable due to the shackle’s 50% greater hardness than that of hardened steel.
  • High-Security Locking Mechanism: The padlock has two ball bearing locking mechanisms and a 4-pin cylinder. This combination offers increased resistance against picking and prying attempts, providing you with peace of mind that your belongings are secure.
  • Extended Shackle for Flexibility: With a 1-7/8 in. 48 mm wide lock body with a 1-1/2 in. (5/16 in.) diameter shackle. (38 mm) long, this padlock offers an extended shackle length. This design facilitates versatile use across a wide range of applications, from securing storage units to locking up expensive tools.
  • Weather Protection: The padlock comes equipped with a covered keyway and shackle. These features add an extra layer of protection against the elements, ensuring that the lock remains functional and rust-free over time.


  • Superior Durability.
  • Cut-Resistance.
  • Enhanced Security Features.
  • Versatile Use.
  • Weather-Resistant.


  • Limited Key Variations.

03. H&S High Security Padlock – a 60mm

Discover the H&S High Security Padlock – a 60mm guardian for all your locking needs, indoors and outdoors. This heavy-duty padlock ensures security for lockers, bikes, garages, and more with durability and advanced key technology. Your go-to choice for safeguarding your valuables.

Features and Specifications:

  • Heavy-Duty Construction for Indoor & Outdoor Use: Crafted for the ultimate protection, the H&S Padlock is tailored to safeguard your possessions regardless of the weather. Its robust build promises to secure your items, whilst the internal mechanism boasts maximum corrosion protection for longevity.
  • Classic Design with Closed Shackle Exposure: Merging a timeless aesthetic with modern needs, this padlock features a closed shackle design (60mm x 40mm) to minimize tampering and bolster security in the most rugged conditions.
  • Durable and Reliable: The padlock stands the test of time and elements with its hardened boron alloy steel construction. Its resistance to corrosion and rust allows for versatile applications, from indoor storage units to outdoor gates.
  • Advanced Key Technology: Accompanied by 5 state-of-the-art keys, this padlock ensures you’re never without access. Share keys, keep spares, and enjoy the ease of use provided by these cutting-edge tools.
  • Ideal for High Exposure Areas: Specially engineered for areas where security risks are heightened, this padlock provides unparalleled security. From gym lockers to retail merchandise, ensure the safety of your valuables with absolute confidence.


  • Versatile Protection.
  • Enhanced Security Features.
  • Key Convenience.


  • Single Size Option.
  • Key Management.
  • Heavier Build.

04. BRINKS 173-80051 Stainless Steel Resettable Combination Discus Padlock

BRINKS offers the BRINKS 173-80051 Stainless Steel Resettable Combination Discus Padlock as the best option for protecting your possessions. Innovative design meets robust functionality for top-tier protection of storage lockers, sheds, tool boxes, and doors.

Features and Specifications:

  • Robust Construction: The padlock features an 80mm stainless steel body complemented by a chrome-plated, hardened steel shackle. This sturdy design ensures maximum cut resistance, standing firm against any attempt at forced entry.
  • Advanced Security: Equipped with a 4-pin tumbler and a single steel bar locking mechanism, this discus padlock offers superior pick resistance. The 4-dial combination allows for thousands of possible numerical combinations, meaning you can personalize your lock for an extra layer of security.
  • High Cut Strength: With a shackle that boasts a cut strength of up to 5300 lbs, this padlock is built to withstand substantial force, ensuring your possessions remain secure under all circumstances.
  • Optimized Design: The round shielded design of the padlock minimizes shackle exposure, protecting it against cutting tools and making it a formidable opponent for thieves.
  • Ease of Use: It’s simple to reset the combination, so you can easily update your security code as often as necessary. The smooth, reliable mechanism ensures easy locking and unlocking every time.


  • Superior cut resistance for enhanced security
  • Personalizable 4-dial combination for added protection
  • Heavy-duty construction for long-lasting durability
  • Minimal shackle exposure deterring potential tampering
  • Trusted Brink’s brand ensures quality and reliability


  • May be heavier than traditional padlocks due to robust construction
  • Not ideal for those who prefer key-access locks

05. Puroma’s 2 Pack Long Shackle Combination Lock

Discover Puroma’s 2 Pack Long Shackle Combination Lock for secure and convenient protection of your belongings. Whether for your gym locker or garden shed, these locks provide peace of mind with top-notch security features and durability. Explore what sets Puroma apart!

Features and Specifications:

  • 4-Digit Combination for Enhanced Security: The Puroma combination lock offers a 4-digit setup, providing you with 10,000 unique combinations. This vast range of potential codes significantly increases security, making it substantially more challenging for intruders to crack your code compared to standard 3-digit locks. Whether in the office, the gym, or while traveling, this feature makes sure that your possessions are kept secure.
  • Innovative Side Window Design: Setting and resetting your combination has never been easier, thanks to the unique side window design. This thoughtful addition allows for effortless, one-handed operation. Unlike traditional combination locks that may require two hands and a struggle to ensure accuracy, Puroma’s design ensures convenience and ease of use without compromising security.
  • Sturdy, Durable, and Weatherproof: Constructed from premium zinc alloy and steel, the Puroma lock is built to last. It is made to endure everyday abuse and to fend off rust and corrosion in all weather. The waterproof nature of these locks makes them ideal for outdoor use, protecting your property rain or shine.
  • Versatile Use with Long Shackle Design: The upgraded long shackle design enhances the lock’s versatility, allowing it to secure a wide range of items and fixtures. From gym and school lockers to gates, sheds, and fences, the extended shackle ensures that this lock can accommodate your needs, providing a secure fit where other locks may not.
  • Compact and Portable: The Puroma combination lock has a compact and lightweight design in spite of its strong construction. This ensures that you can easily carry it with you wherever you go, offering enhanced security without the added bulk.


  • High Security.
  • User-Friendly.
  • constructed from premium components.
  • The long shackle design broadens the range of applications.
  • Easy to carry without weighing you down.


  • Learning Curve.
  • Size Limitations.

Factors to Consider When Choosing a Lock

Selecting the right lock isn’t just about the type of lock, but also a host of other important considerations.

  • Security Level: When assessing the security of your storage unit, it’s crucial to consider the location and the value of the items housed within. In areas prone to high crime rates or when storing valuable possessions, opting for a high-security lock becomes paramount.
  • Durability: Any attempt at forcible entrance should be foiled by the lock you select. Opt for locks made from robust materials like hardened steel to ensure maximum resilience.
  • Weather Resistance: For storage units exposed to various weather conditions, selecting a lock that can endure without rusting or freezing is vital for long-term functionality.
  • Size and Fit: It’s essential that the lock fits snugly into your unit’s locking mechanism, leaving minimal room for manipulation or break-ins.
  • Keying Options: Explore the possibility of having multiple keys, key copies, and the convenience of rekeying or replacing the lock if necessary for added security measures.
  • Price Range: While considering your budget, remember that the cost of the lock correlates directly with its security features and durability. Make it a priority to purchase a lock that satisfies your security requirements without sacrificing quality.

Tips for Maintaining and Maximizing Lock Security

After making your purchase, it’s critical to maintain your lock to keep it in optimal operating order.

  • Regular Inspection: Regularly check your lock for signs of tampering, wear, or damage. Early detection is crucial as it can help prevent potential security threats that may compromise the safety of your property or belongings.
  • Lubrication: Ensure your lock is well-lubricated to reduce the likelihood of failure and prevent rust from developing. It’s recommended to use non-oil-based lubricants to avoid attracting dirt and debris, which could affect the lock’s functionality over time.
  • Proper Key Management: Effective key management involves keeping a close track of keys and their copies. By doing so, you can significantly reduce the risk of unauthorized key duplication or loss, enhancing the overall security of your premises.
  • Upgrading Security Measures: Enhance your security by integrating your lock with additional security features such as security bars and alarms. This multi-layered defense system provides added protection and peace of mind against potential intrusions or break-ins.

Frequently Asked Questions

Q1: How should I store my spare keys for the unit lock?

Answer: It is good to have an extra key kept with a trusted friend or family member or in a safe place at home.

Q2: Can I upgrade the lock provided by the storage facility?

Answer: In most cases, you can upgrade the lock to your own as long as it complies with the storage company’s regulations.

Q3: Will insurance companies provide discounts for certain types of locks?

Answer: Many insurance providers do offer discounts for using high-quality locks. To find out about any available reductions, contact your insurance provider.

Q4: Will a bigger lock mean better security?

Answer: While size can be a factor, the construction, material, and strength of the lock are more important indicators of security.

Q5: Are there any specific laws or regulations regarding locks for storage units?

Answer: Depending on your location, there may be regulations on the type and quality of locks required for storage units. Research local laws or ask your storage facility for guidance.

Disclaimer: Expert expertise and industry best practices serve as the foundation for the information in this book. However, no guide can guarantee complete protection against theft or other security risks. It is important to use your best judgment and consider the unique circumstances of your storage unit location and contents when selecting a lock.

Personal Experience: In my years of managing storage units, I have seen first-hand the importance of choosing a lock that is both a deterrent and a reliable barrier against theft. The right lock can save you from the heartache of losing your valuables and the headache of navigating insurance claims. Personal experience and industry insight have consistently led me to recommend heavy-duty disc locks for their balance of security and functionality.

Why Trust Our Content?

Our team of security professionals and storage industry experts have poured over the data to bring you the most accurate and comprehensive guide to securing your storage unit. Our aim is to provide you with the necessary knowledge to make an informed lock selection.

As an Amazon Associate I earn from qualifying purchases.