How to Rekey a Commercial Cylindrical Lock Step by Step

Locks are your first line of defense when it comes to securing commercial spaces. After all, the safety of your business, assets, and employees is something you can’t leave to chance. While installing locks is a basic security measure, understanding how to rekey a commercial cylindrical lock can provide that added layer of safety when you need it the most. Whether you’re managing a new tenant, upgrading your site's security, or addressing the risk of lost keys, rekeying is an economical and efficient option.

This guide will walk you through the process step by step, equipping you with the knowledge you need to secure your space. Plus, we'll throw in some helpful tips to make the task easier!

What Is a Commercial Cylindrical Lock?

Before we jump into the rekeying process, it’s helpful to know what a commercial cylindrical lock is and why it’s widely used in business spaces.

A commercial cylindrical lock is a type of lock commonly used in office buildings, retail stores, schools, and industrial facilities. These locks operate by using a cylinder mechanism to control the locking and unlocking process. They are preferred for their durability, resistance to wear and tear, and commercial-grade build standards that withstand frequent use.

Common Features of a Commercial Cylindrical Lock:

● Built to fit both light and heavy-duty commercial doors

● Available with multiple keying options (e.g., master keying, keyed alike)

● Designed for compatibility with various lock grades (Grade 1 being the most secure)

Now that you have a foundational understanding of the lock, let's move on to the rekeying process.

Why Rekey Your Commercial Cylindrical Lock?

Rekeying involves changing the internal mechanism of a lock so it can work with a new key while the old key becomes useless. This practice allows you to improve security without replacing the entire lock, saving time and money.

Common Scenarios Where Rekeying Is Beneficial:

● Lost or Stolen Keys: Prevent unauthorized access if keys fall into the wrong hands.

● Employee Turnover: Ensure former employees can no longer access your premises.

● Tenant Changes: Enhance safety for new occupants in a leased property.

● Master Key Setup: Create a single key for better access control across multiple locks.

Rekeying is not only cost-effective but also an easy way to maintain peace of mind.

Tools You’ll Need to Rekey a Commercial Cylindrical Lock

Gather the following tools and supplies to make your rekeying process smoother:

● Rekeying kit (compatible with your lock brand)

● Key gauge (for measuring pins)

● Plug follower

● Tweezers or small flathead screwdriver

● Existing key

● New key

● Phillips and flathead screwdrivers

● Small lubricant (optional)

Once you have these tools ready, it’s time to roll up your sleeves!

Step-by-Step Guide to Rekey a Commercial Cylindrical Lock

Step 1. Remove the Cylindrical Lock from the Door

● Begin by unscrewing the cover plate of the lock using a Phillips screwdriver.

● Insert the existing key into the lock and turn it to the unlock position.

● Gently pull the lock assembly out of the door.

Step 2. Disassemble the Lock Cylinder

● Locate the retaining clip, which secures the cylinder to the lock housing. Use a flathead screwdriver or tweezers to remove it.

● With the retaining clip removed, slide the cylinder out of the lock.

Tip: Use caution when handling delicate parts to avoid damaging the components.

Step 3. Use the Plug Follower to Remove the Plug

● Insert the existing key into the cylinder and turn it slightly counterclockwise.

● Carefully push the plug follower through to remove the plug. This will expose the pins and springs inside the core. Be cautious not to lose or mix up any pins or springs during this process.

Step 4. Replace the Lock Pins

● Empty the existing pins onto a clean surface. Make note of their positions for reference, if needed.

● Using the key gauge, measure the length of the new key cuts. This will determine the new pin sizes.

● Insert the correct pins into the plug according to the new key’s measurements. Double-check that all pins sit flush within the plug.

Pro Tip: If the pins don’t align properly, the key will not turn smoothly. Ensure the pin heights match the key's cuts accurately.

Step 5. Reassemble the Cylinder

● With the new pins securely in place, reinsert the plug into the lock cylinder, using the plug follower to guide it back into position and prevent spring misalignment.

● Replace the retaining clip to secure the cylinder.

Step 6. Test the New Key

● Insert the new key into the lock and turn it a few times to confirm smooth operation.

● Test both the old and new keys. The old key should no longer work.

Step 7. Reinstall the Lock

● Reattach the cylindrical lock to the door by reversing the removal steps. Ensure all screws are tightened securely but not overly so.

● Test the lock one final time after installation to ensure everything is functioning correctly.

Tips for Successful Rekeying

● Read the Instructions: Most rekeying kits come with manufacturer-specific guidelines, so make sure to follow them closely.

● Work in Good Lighting: Small pins and springs can be difficult to see clearly in dimly lit areas.

● Organize Your Workspace: Lay down a mat or work on a flat, clean surface to avoid losing any tiny parts.

● Practice Patience: Precision is critical, so take your time to ensure the rekeying process is done correctly.

When to Call a Locksmith

Though rekeying a commercial cylindrical lock is a manageable DIY task for many, sometimes it’s best to leave the job to a locksmith. If you encounter any of the following issues, seek professional support:

● You don’t have the existing key.

● The lock design is more complex than anticipated.

● Pins or springs become damaged or irretrievably misplaced.

Locksmiths have the advanced tools and training needed to resolve these challenges efficiently.

Keeping Your Locks Secure

Rekeying is an essential part of maintaining security in any commercial property. By learning how to rekey a commercial cylindrical lock, you can save money and enhance peace of mind for employees, tenants, and customers alike. It’s an essential skill for property managers, business owners, and maintenance professionals.

If you’re ready to streamline your lock maintenance, rekeying is an excellent place to start!

Commercial Cylindrical Lock

Cylindrical Lock

Commercial Lock