How to Rekey a Lock Cylinder: Professional Tips
Published Date: Dec 3, 2025
Rekeying a lock may seem like something only a professional should handle, but with the right tools and clear instructions, it’s something many homeowners can do on their own. However, it’s not always the right solution — especially if you’re dealing with worn-out hardware or managing multiple locks. In this guide, Sure Lock & Key walks you through how to rekey a lock cylinder, explains when a DIY job makes sense, and shows when it’s best to call a locksmith.
How a Pin Tumbler Lock Works and Why It Matters for Rekeying
Most residential and commercial locks use a pin-tumbler mechanism. Inside the cylinder are tiny spring-loaded pins arranged in pairs. When the correct key is inserted, each pin aligns at a precise height along the shear line, allowing the plug to rotate and unlock the door. If the wrong key is used, the pins don’t align properly — and the lock stays shut.
This basic design is exactly what makes rekeying possible. During lock rekeying, you’re replacing these pins to match a new key’s shape. Understanding
how pin tumbler locks work helps you follow each step with more confidence — especially if you’re planning to do it yourself.
DIY Rekeying: When It’s Possible (And When It’s Not)
Rekeying is a good DIY project if:
- Your lock is in good condition (not rusty, jammed, or damaged)
- You have the original working key
- You purchase a compatible lock rekey kit (like a Schlage rekey kit or other brand-specific version)
It’s not recommended for high-security locks or multi-lock systems. In those cases, calling a licensed locksmith ensures proper handling, safety, and peace of mind.
Step-by-Step Guide: How to Rekey a Lock Cylinder
Step 1: Prepare Your Tools & Remove the Lock
You’ll need a rekeying kit, your current working key, a screwdriver, and basic locksmith rekeying tools like a cylinder follower, plug clip remover, and tweezers. Start by unscrewing and removing the doorknob or deadbolt. Then, remove the lock cylinder from its housing carefully.
Step 2: Take Apart the Cylinder
Use the follower tool to push the plug out of the cylinder, applying even pressure to prevent the pins and springs from falling. Keep track of parts — losing even one pin can cause problems later. Remove the old pins using tweezers.
Step 3: Insert New Pins
Insert your new key into the plug. Use the pin chart from your kit to identify the correct pin heights that match the new key’s cuts. This step is called pin tumbler rekeying. Insert pins into the correct chambers, making sure they sit flush with the plug surface. If any pin sticks out, recheck the pin size.
Step 4: Reassemble and Test
Carefully reinsert the plug using the follower tool to keep pins in place. Reattach the cylinder into the lock housing and reinstall the lock on your door. Insert the new key and test it several times. If it sticks or won’t turn, reopen the cylinder and check pin alignment.
Rekey vs Replace Lock: Which Should You Choose?
Not sure if rekeying is enough? If your lock is damaged, outdated, or you want to upgrade your home security, a lock cylinder replacement might be the better option. However, if your hardware is still in great shape, rekeying is faster, cost-effective, and just as secure.
Not sure which path fits your needs? This helpful breakdown of the advantages of rekeying the locks can help you decide what’s best.
Commercial Rekeying & Multi-User Access
For business owners, landlords, or anyone managing multi-tenant buildings, rekeying is part of regular property maintenance. Commercial lock rekey allows you to keep control over access after staff changes, lease turnover, or security upgrades.
It’s also often used during master key system installation, where one key opens multiple locks while individual users still have limited access. Commercial systems are more complex and require precise pin configurations — something best left to experienced professionals.
Not sure how often you should rekey in a business setting? Check out our insights on how often to rekey commercial locks to get clarity on best practices.
If you manage a business or commercial space, it’s always a good idea to have a trusted commercial locksmith on call — someone who can handle rekeying, repairs, and upgrades when needed, with minimal disruption to your business.
Lock Rekeying Made Simple with Sure Lock & Key
Rekeying offers a secure, affordable way to control who has access to your property — but it’s not always easy, especially for multi-lock systems or if you’re missing a key. At Sure Lock & Key, we’ve helped thousands of homeowners and business owners across the U.S. find the right solution for their security needs. Whether you need a single lock rekeyed or a full master key system installation, we’re here with prompt services and honest advice.
Ready to upgrade your security? Reach out today and let Sure Lock & Key help you rekey with confidence.
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Frequently Asked Questions
What is lock rekeying and how does it work?
Lock rekeying is the process of changing a lock’s internal pins so a new key can operate it, without replacing the entire lock.
How to rekey a door lock without a key?
It’s tricky without the original key — you’ll likely need to pick the lock or use special tools. In most cases, it’s safer to call a locksmith.
How to rekey a door lock cylinder?
Use a rekeying kit with the correct tools, remove the cylinder, replace the pins to match your new key, and reinstall everything carefully.
How to rekey a Schlage lock cylinder?
Use a Schlage rekey kit to remove the lock cylinder, replace the pins based on your new key, and reassemble the lock. Follow the included instructions closely for best results.
How to rekey a Kwikset lock cylinder?
If it’s a SmartKey version, insert the reset tool and follow the brand instructions. For pin tumbler models, standard rekeying applies.
How to rekey a lock to match the existing key?
Rekey the second lock by inserting pins that match the cuts of the existing key — this allows one key to open multiple locks.