A Simple How-To Guide On Rekeying Master Locks

Key Takeaway

  • To rekey your Master Lock, you would need a rekeying kit.
  • Insert the rekeying kit in the rekeying hole while the original key is inside the keyhole, then replace the key with the new one.
  • In case the original key is not handy, disassemble the lock to manipulate the pins to rekey the Master lock.

When I first moved to Toronto into a rented condo, I was a bit apprehensive when I realized that the locks on all of my doors were Master Locks that were keyed alike. It seemed like it was going to be impossible to secure my apartment without completely replacing all of the locks. 

After some research, however, I discovered the process of rekeying a Master Lock, which allowed me to change the lock tumblers so they would no longer accept the original key but still open with a different one. Rekeying Master Locks can seem like a daunting task for someone who has never done it before, but it is actually a fairly straightforward process that can be completed in a few simple steps. 

If you’re looking for a quick and easy guide on rekeying Master Locks, then you’ve come to the right place! In this blog post, we’ll go over the basic process of rekeying Master Locks with step-by-step instructions to make sure you get the job done correctly.

Why You Might Need To Rekey A Master Lock?

There are several reasons why you might need to rekey a Master Lock, a few of which are listed below.

  • To improve the security of a home or business premises – if keys have been lost or stolen, rekeying is a cost-effective way to maintain security without replacing locks and other hardware.
  • If tenants change in a rental property, rekeying is necessary to ensure that only authorized individuals have access to the building.
  • For a major remodeling project, when different locks may have been used for various doors throughout the house, rekeying allows for all of these to be replaced with one master key.
  • When multiple people have access to one space, such as an office or shared accommodation, it can be beneficial to periodically change the locks so that everyone’s access codes are different.

Materials Needed

When it comes to rekeying a Master Lock, you’ll need a Master Lock rekeying kit, a pair of pliers, a flathead screwdriver, and a few spare minutes.

Master Lock Rekey Kit

With all of these items in hand, you’ll be ready to get started on how to rekey your Master Lock.

The Process Of Rekeying Master Locks

The Process Of Rekeying Master Locks

Rekeying a Master Lock is a fairly straightforward process and can be done in minutes with the right tools. With a Master Lock Rekeying Kit, you will be able to easily replace the lock cylinder and make the lock work with a new key. 

Here are the steps you need to take to rekey a Master Lock:

  • Step 1: Start by inserting your existing key into the lock cylinder and turning it clockwise to unlock the lock.
    lock cylinder
  • Step 2: Once you have done this, let the key be inside the lock and find the rekeying hole situated beside the keyhole.
    inside the lock
  • Step 3: Now, take the rekeying kit and insert it into the rekeying hole. Ensure to press the rekeying tool flush against the lock.
    rekeying kit
  • Step 4: Next, take out the original key without altering the rekeying tool’s position. If you’re unable to take out the original key from the lock, this could be due to the fact that the rekeying tool was not inserted properly.
    rekeying tool’s position
  • Step 5: Now insert the new key that you wish to use into the lock keyhole. Ensure that the new key is fully inserted for a successful rekeying of the Master lock.
    insert the new key
  • Step 6: Gently remove the rekeying tool while being careful not to disrupt the new key’s placement. 
  • Step 7: Next, turn the key counterclockwise until it stops. This will move the pins into place and allow them to engage with the notches in the lock.
  • Step 8: Once all of the pins are in place, turn the key back in a clockwise direction until it stops. This will complete the rekeying process and enable you to use your new key in place of the old one.

Finally, test out your new key by locking and unlocking the key. If everything has gone according to plan, then your Master Lock should now be rekeyed and ready to use. 

How To Rekey Master Lock Without The Original Key

How To Rekey Master Lock Without The Original Key

Rekeying a Master Lock without the original key is a technical process that requires dissembling the lock and hence, must only be performed if you are confident. In most cases, I do recommend leaving this task to the professionals. 

However, if you wish to try your hands on the procedure, here are the steps to rekey the master lock without the original key.

  • Step 1: Take apart the lock so that you can access the cylinder and its components. You can open the lock body by removing the retaining screws. Then remove the retaining clip from the back of the cylinder and carefully slide out the inner cylinder.
  • Step 2: Once you can access the lock cylinder, use a pair of needle nose pliers to remove each of the pins inside the cylinder, one at a time. 
  • Step 3: Put the desired new key into the lock cylinder Then insert the corresponding pins from the master key set into the holes. Make sure all of the pins are lined up properly.
    lock cylinder
  • Step 4: Once all of the pins are in place, gently slide the inner cylinder back into its original position and replace the retaining clip to secure it in place.
  • Step 5: Test your work by trying out the new key in the lock. If it works, then your rekeying job is complete.

Frequently Asked Questions

Q1. What are some points to keep in mind to rekey the master padlock?

Answer – Rekeying a Master Lock is an easy process that only requires a few tools and materials. To make sure that you get the job done quickly and efficiently, there are some tips and tricks you should keep in mind.

First, make sure you have the right tools for the job. A small flathead screwdriver, a rekeying kit, and a new key should all be available. If you don’t have the right tools, it can be difficult to get the job done properly. 

Next, make sure to read any instructions that come with your rekeying kit. Different kits may require different techniques or tools, so it’s important to make sure you know what you’re doing before you get started. 

Q2. How much does a locksmith in the US charge to rekey a master lock?

Answer – The cost of rekeying a Master Lock can vary depending on the size and complexity of the lock, but it’s generally less expensive than buying a new one. Usually, a locksmith would charge somewhere around $50 to $200 to rekey a Master Lock.


Rekeying Master Locks may seem like a challenging task, but it can be easily DIY-ed. With the right materials, a little bit of patience, and guidance from this blog post, you can easily learn how to rekey Master Locks without the original key. 

Now that you know how to do it, you can rekey your own locks as often as you need. If you found the information helpful, share it with your friends and family who might need it. 

Write to me in the comment section for any other query regarding home security.

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Hey! I am Mark. Though I am not a locksmith by profession, but locks have always fascinated me since my teens. And it all started when I got locked out of my house and I had to pick the lock. Since then it has become my hobby to learn more about different kinds of locks, understand their working and methods to pick them up. In due course of time, I have also become better aware of how installing the right lock goes a long way in ensuring iron clad security. I aim to share my passion (about locks) through this blog. If you are also passionate about picking locks or are just looking to beef up the security, hop on the ride.