How to Rekey Locks

  1. Overview
  2. Technical Procedures
  3. How to Rekey Locks

How to Rekey Locks

 

1. What is Rekeying a Lock?
Rekeying a lock means changing the internal pins in the lock cylinder so that it works with a new key. This process allows you to keep the existing hardware while improving security by disabling old keys.

2. Why Rekey a Lock?

  • Improved Security: Old keys will no longer work, preventing unauthorized access.

  • Convenience: Use a single key for multiple locks by rekeying them to match.

  • Cost-Effective: Rekeying is cheaper than replacing the entire lock.

3. Tools and Resources You Need

  • Rekeying kit (specific to your lock brand, e.g., Kwikset, Schlage)

  • Cylinder follower

  • Key decoder (not necessary)

  • Replacement pins

  • Original key and new key

  • Shims

4. Step-by-Step Guide to Rekey Locks

Step 1: Remove the Lock Cylinder

  • For deadbolts or knob locks: Use a screwdriver to remove the lock from the door.

  • For mortise locks: Take off the faceplate. Then, find the screw that holds the mortise and unscrew it. After that, carefully remove the cylinder.

Step 2: Access the Cylinder

  • Insert the original key and turn it slightly to align the cylinder for removal. If you don’t have the original key you can use shims.

  • Use a cylinder follower to push the cylinder out of the cylinder housing, making sure the pins and springs stay in place.

Step 3: Replace the Pins

  • Remove the old pins from the cylinder.

  • check by eye to make sure it’s flat on the cylinder or use the key decoder to find the pin heights for the new key.

  • Insert the new pins into the cylinder according to the new key's specifications. Ensure the pins are flush with the cylinder surface when the new key is inserted.

Step 4: Reassemble the Lock

  • Slide the cylinder back into the cylinder housing, using the cylinder follower to hold the pins and springs in place while pushing the cylinder back to the cylinder housing.

  • Reattach the lock mechanism to the door.

Step 5: Test the New Key

  • Insert the new key and ensure it turns smoothly.

  • Confirm the lock no longer works with the old key.

 

5. Rekeying Tips and Troubleshooting

  • Match the Rekey Kit to the Lock Brand: Make sure the pins are sitting on a perfect level in the cylinder, if they are too high or too low it will get stuck.

  • Use a Cylinder Follower: Prevent the springs and pins from falling out during rekeying.

  • Test Before Reassembly: Test the lock with the new key before reinstalling it on the door.

 

6. Video Tutorials for Rekeying Locks

 

Helpful Articles for Rekeying Locks

Written By Eva

Last updated February 11, 2025
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