How to Replace a Locker Lock (Step-by-Step Guide)

If you need to replace a locker lock, the process is usually straightforward. However, choosing the correct replacement is critical. Ordering the wrong cam length or barrel size wastes time and increases cost.

This step-by-step guide explains how to remove the existing lock, measure correctly and select the right replacement locker locks for schools, gyms, workplaces and leisure centres in the UK.

When Should You Replace a Locker Lock?

• The key number is unreadable.
• The lock barrel spins freely.
• The cam arm is bent or broken.
• The master key has been compromised.
• The mechanism has been forced.

In many cases, replacing the key is sufficient. However, when the mechanism is damaged, full locker lock replacement is necessary.

Tools You Will Need

• Flat-head screwdriver
• Adjustable spanner or socket
• Replacement cam lock
• Protective gloves

Step 1: Open the Locker

Ensure the locker door is open before beginning. If the key is lost and the locker is locked, controlled access may be required. Avoid drilling unless absolutely necessary, as this increases cost.

Step 2: Remove the Retaining Nut

Inside the locker door, you will see a threaded barrel secured by a retaining nut. Use a spanner to loosen and remove this nut carefully.

Step 3: Remove the Cam Arm

The cam arm is the flat metal piece that rotates to secure the door. Slide it off the barrel once the nut is removed.

Step 4: Measure the Lock Correctly

This is the most important step.

• Barrel length: Measure from the front face to the rear of the threaded body.
• Cam length: Measure from the centre of the fixing hole to the tip of the cam arm.
• Door thickness: Confirm the metal gauge or panel thickness.

Common cam lengths include 15mm, 20mm and 25mm. Ordering the wrong length will prevent correct door engagement.

Step 5: Identify the Lock Type

Confirm whether the existing lock is:

• Standard cam lock
• Mastered cam lock
• Coin operated lock
• Heavy-duty industrial lock

If you are unsure, compare your measurements with available locker lock options before ordering.

Step 6: Install the New Lock

Insert the new barrel through the door from the outside. Ensure the key slot is vertical.

• Reattach the cam arm in the correct orientation.
• Replace and tighten the retaining nut.
• Test operation before closing the door.

Common Mistakes to Avoid

• Guessing cam length.
• Over-tightening the retaining nut.
• Ordering without confirming barrel diameter.
• Replacing entire lock when key replacement was sufficient.

Cost Considerations

Standard cam lock replacement in the UK typically costs significantly less than full locker replacement. Holding spare stock reduces emergency ordering costs.

Bulk ordering replacement locker locks for schools or gyms can reduce long-term maintenance spend.

When to Upgrade Instead of Replace

If failure rates exceed 10% annually, review the overall locking system. Frequent breakage may indicate low-quality hardware or misuse patterns.

Professional Advice for Facilities Managers

Maintain a lock register including:

• Locker number
• Lock type
• Key code
• Installation date

This reduces diagnostic time and simplifies future locker lock replacement.

Final Thoughts

Replacing a locker lock is a simple process when measured correctly. The key is precision. Identify barrel length, confirm cam size and order accurately.

If you are ready to purchase, browse the full range of replacement locker locks to ensure correct compatibility and secure installation.