How to Unlock a Master Lock Without the Combination

It’s very frustrating when you forget the code for your master lock, and you need to access the locker at your workspace, gym, or home. But don’t worry! Before you hire a residential or commercial locksmith, you can use some techniques to unlock a master lock without the combination, and you don’t always have to use destructive techniques. In this article, we will walk you through these methods step-by-step.

Proven Methods to Unlock a Master Lock Without the Combination

Let’s learn how you can use each method to unlock a master lock without the combination. Try to follow each method properly to ensure you access the locker in no time.

1. Use the Listen and Feel Technique

Gently pull up on the left side of the shackle. Slowly spin the dial clockwise until you hear a click sound. Add 5 to it, and it’s your first number. Spin the dial a few times to reset the lock and set the first number as your starting point. Turn the dial counterclockwise until you reach a point where it’s difficult to turn it. Now that you have the first two numbers, you can test every possible combination for the third one. 

Read more: “How Much Does a Locksmith Cost for a House? 2025 Pricing Breakdown”

2. Create a Shim

This method might not work on recently made locks. Cut a strip (about an inch wide) of metal from an aluminum can. Hold it horizontally and make curved incisions (not all the way to the top) so that a U shape is created. Fold the top part downward an eighth of an inch, then turn the sides around the folded top part.

Fold the shim around the left part of the shackle (The U of the shim must be on the inner part of the shackle).  Push the shackle up with your other hand as far as it will go, then work the shim inside the crack. Press the shackle down, then pull it up, and the lock should open.

Are your keys locked in the trunk? Click the link to learn some techniques to use in these situations.  

3. Use the Serial Number

Some locks have a serial number that is stamped on them. Remember that the lock must not be attached to anything, so you can take it to a distributor or a retailer of the brand. They can contact the manufacturer, verify your ownership, and give you the combination. 

You can also visit the manufacturer’s website to see if they offer this service. If your locker is in an office, a gym, or a school, talk to the owner, as they might have the combination of that lock.

Note: If these methods were not successful, you can hire a residential locksmith professional to unlock the master lock. There are also mobile locksmiths who can open the lock on the spot.

What Not to Do When Trying to Unlock a Master Lock Without the Combination

There are things you should avoid when you’re trying to unlock a master lock without the combination, or you might damage the lock. Let’s take a look at them:

1. Don’t use too much force, as it can break the lock or your tools.
2. Use drilling as a last resort because it can completely ruin the lock.
3. Make more attempts. You might not always make it the first time.
4. Avoid using unnecessary or incompatible tools, as they can damage the lock.
5. Sometimes the combination is hidden inside the packaging, so don’t forget to check that.

Do you own a luxury car that needs key replacement? Visit our blog on luxury car key replacement to know more about different key types and the costs of locksmiths.

How to Maintain Your Master Locks and the Combinations

Ok, let’s say you successfully managed to unlock a master lock without the combination. Now, it’s a good practice to protect your locks and prevent these situations from happening in the first place.

• Use a piece of paper or a digital password manager to record the combination. 
• Use a graphite or silicone-based lubricant so the shackle and dial can move smoothly.
• Don’t store your locks in damp environments, or they will rust.
• Use the combo to unlock the lock every now and then to make sure you don’t forget it.

Be careful when you’re hiring new locksmiths! Here we will tell you what you should know about common mistakes new locksmiths make.

Unlock Your Master Lock and Access Your Locker in No Time 

You learned that you can unlock a master lock without the combination. Use the ‘feel and listen’ technique, create a metal shim, or take the serial number to a distributor. Don’t forget to maintain your locks and record your combinations. If you are locked out of your house and can’t get in, 247 GTA Locksmith provides 24/7 skilled emergency locksmiths in Toronto who will quickly come to your help.

FAQ

Have you ever tried one of these methods to unlock a Master Lock without the combination? Share your experience or questions in the comments. We’d love to hear from you!