How to Change a Locker Cam Lock

Step-by-step instructions on how to change a locker cam lock for schools, gyms, and workplaces.

Why You Might Need to Replace a Locker Cam Lock

Over time, locker cam locks naturally wear down from constant daily use — especially in high-traffic areas such as schools, gyms, leisure centres, and workplaces where lockers are opened hundreds of times a week. Keys can become lost or bent, barrels can seize up, or the internal cam mechanism can start to stick, making it difficult to lock or unlock the door properly.

In some cases, the lock might have been forced, vandalised, or simply reached the end of its lifespan. Replacing a worn or damaged cam lock isn’t just about convenience; it’s essential for maintaining security and preventing users from being locked out or leaving lockers unsecured. Many sites also choose to replace their cam locks when updating to a new keying system — for example, moving from individually keyed locks to a master-keyed or keyed-alike setup for easier management.

Regular maintenance and replacement of locker locks can also help reduce downtime, avoid repair call-outs, and keep your facilities running smoothly. Whether you’re a caretaker, site manager, or maintenance engineer, knowing how to change a locker cam lock yourself can save time, money, and a lot of hassle.

What You'll Need:

Tool / Item	Purpose
🔩 Replacement Cam Lock	To match your old lock (barrel length, cam type, key system).
🪚 Screwdrivers (Flathead & Phillips)	To remove screws and clips.
🔧 7mm / 8mm Spanner or Socket	To undo the fixing nut or ping off the horseshoe clip.
🧲 Needle-Nose Pliers	To handle the small clips or washers.
🧻 Masking Tape or Marker	To mark the cam bar orientation.
🧤 Gloves & Eye Protection	To ensure safety whilst working.

*Top Tip: Keep the old lock handy until the new one's fitted — it helps double-check orientation and parts.

Step-by-Step: Removing the Old Cam Lock

Open & Clear Contents

Make sure the locker compartment is unlocked and empty so you've got full access to the inside of the door.

Mark the Cam Position

From the inside, locate the cam and mark its current position with tape or a pen — this saves time later.

Remove the Cam Retainer

Use pliers or a screwdriver to remove the small screw or clip holding the cam in place against the back of the door.

Undo the Lock Nut

Use your spanner or socket to remove the cam nut that holds the barrel. Keep washers and nuts safe.

Remove the Barrel

Slide the cam lock barrel out from the front of the door. If it’s tight, wiggle it — don’t use much force on the faceplate.

*Top Tip: Wipe the door hole clean before refitting — dust and burrs can affect fitment.

Step-by-Step: Fitting the New Cam Lock

Match the Lock Type

Check the new cam lock matches the original (e.g. barrel length, lock series).

Insert the Barrel

Push the new cam lock through the hole on the front of the door until it sits flush.

Attach the Cam

Fix the cam onto the rear of the barrel in the same position as your mark. Secure it with the supplied screw or clip.

Tighten the Nut

Add the washer and nut to the back of the barrel. Tighten gently — firm, but not overtight.

Test the Lock

Turn the key several times to check it lock and unlocks, lines up with strike plates, and doesn't rattle or spin in the hole.

*Top Tip: If it's misaligned, remove the cam and rotate it 90° or 180° until it engages perfectly.

Troubleshooting Common Issues:

Problem	Likely Cause	How to Fix
Cam Doesn't Reach Strike	Wrong cam shape or angle.	Try offset cam or rotate position.
Key Won't Turn	Nut too tight.	Loosen slightly.
Lock Too Short	Barrel too small for door thickness.	Order a longer barrel lock.
Master Key Doesn't Fit	Wrong lock for the key series.	Check with supplier and replace.

💡Trade Tips:

Keep spare cams and nuts in your van or toolbox.
Note key codes on replacement locks for records.
For multi-locker sites, use keyed-alike or master-keyed locks.
Always check the cam rotation direction (clockwise or anti-clockwise).
Replace escutcheons or number plates while the door's open — saves another visit!

When to Call a Specialist

If your locker lock is corroded, seized, damaged, or vandalised, it’s always worth contacting a specialist rather than trying to force it out or fit a random replacement. Old or rusted cam locks can be tricky to remove and may damage the locker door or panel if handled incorrectly. In busy environments like schools, gyms, offices, hospitals, or leisure centres, a failed or jammed lock can quickly turn into a bigger issue — especially if users can’t access their personal belongings or if lockers are left unsecured.

By contacting us, our team can help you identify the exact replacement cam lock you need, even if the original part number or brand isn’t visible. Simply send over a clear photo of the lock face, key, or locker door, and we’ll match it to the correct model. We also supply bulk replacement locks for full site refurbishments, ensuring every locker is fitted with the right size and style for your setup. Whether it’s a quick single repair or a large maintenance project, we’ll make sure you get the correct parts — quickly, easily, and without the guesswork.

Locker Locks & Spare Parts with Trade Prices and Next-Day Delivery