In this guide, we’ll walk you through the process of rekeying a mortise lock, step by step. Rekeying a lock is a useful skill, whether you’re a DIY enthusiast or a professional looking to secure your home or business.

If you’re ready to dive in, check out the video below where we demonstrate the entire process!

What is Rekeying and Why Do It?

Rekeying a lock means changing the internal pins of the lock to match a new key, making the old key obsolete.

It’s an effective way to enhance security without needing to replace the entire lock.

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Tools You’ll Need

Before we get started, here’s what you’ll need to successfully rekey your mortise lock:

Screwdriver
Follower tool
Pinning kit or new key pins
Key decoder (optional but helpful)
New key
Tweezers (for handling small pins)

Step-by-Step Guide to Rekey a Mortise Lock

1. Test the Keys
Start by testing the current key to confirm it works with the lock. Then, try the new key. You’ll see that the new key doesn’t turn the cylinder, which is why we’re rekeying.

2. Disassemble the Cylinder
Using a flathead screwdriver, locate and loosen the set screw that holds the cylinder in place. Unscrew the cylinder from the lock body carefully. Then, use a follower tool to push the cylinder plug out, keeping the top pins in place to avoid them falling out.

3. Remove the Old Pins
Set aside the old key pins. You’ll no longer need these since we’re updating the lock to work with a new key.

4. Insert New Key Pins
Using a pinning kit, match the new pins to the key cuts of your new key. Place the new pins in the corresponding slots in the cylinder. It’s important that the pins sit flush with the shear line—this ensures the key will turn smoothly.

5. Reassemble the Lock
Once the new pins are inserted and everything looks good, reinsert the cylinder plug, using the follower tool to guide it back into the lock body. Be sure to screw it in securely but not too tight.

6. Test the Lock
Insert the new key and test it to make sure it turns the lock smoothly. Also, test the old key to confirm it no longer works. If everything functions as expected, you’ve successfully rekeyed your mortise lock!

When Should You Rekey a Lock?

Rekeying is recommended in the following situations:

Moving into a new home or office space

Lost or stolen keys

To prevent previous tenants or owners from having access

After a security breach or break-in

Frequently asked rekeying questions.

How long does it take to rekey a mortise lock?

Rekeying typically takes about 15 to 30 minutes, depending on your skill level and experience.

Do I need special tools to rekey a lock?

Yes, rekeying requires a few specialized tools like a follower tool and a pinning kit, which are essential for the process.

Can I rekey all types of locks?

Not all locks can be rekeyed. Mortise locks, deadbolts, and other pin tumbler locks are typically rekeyable. If you’re unsure, consult a professional locksmith.

Is rekeying more secure than replacing a lock?

Rekeying can be just as secure as replacing the lock, as long as the lock itself is in good condition. It’s often more affordable as well!

Save Time and Avoid the Stress

Want to skip the DIY? We’ve got you covered! Save yourself the hassle and let Safe and Secure Locksmith take care of everything. Whether you need mobile locksmith services or prefer in-shop assistance, we’re here to help.

Browse our range of products and services in our online store, where you can place orders for both mobile services or in-shop support. Whether it’s rekeying, lock replacements, or new installations, we’ll get the job done quickly and stress-free.

Order online today!
Visit our store to schedule your service or shop our security products. We’re ready to make your home or business more secure with just a few clicks.