How Do You Choose A Padlock For Lockers With Cam Latches?
How Do You Choose A Padlock For Lockers With Cam Latches?
Many lockers look similar on the outside, but the fastening method can vary. The two most common systems are:
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Hasp and staple
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Cam latch
Both are designed to be secured with a padlock, but they work differently. This difference is important when choosing the correct padlock size and shackle thickness.
Hasp And Staple Lockers
A hasp and staple fitting is very straightforward. If the padlock fits through the staple and closes, the locker is secure. In schools, gyms, and workplaces, a 30mm padlock is typically used here because:
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It is small
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It is cost-effective
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It provides enough security for indoor lockers
For this setup, the specific shackle thickness is less critical, as long as the padlock closes fully.
Cam Latch Lockers
Cam latches operate differently. Instead of hooking over a staple, the latch rotates to lock and unlock the door. The padlock prevents this rotation.
However, if the padlock’s shackle is too thin, the latch can still turn even when the padlock appears to be locked.
This is the problem seen most often when a 30mm padlock is used on a cam latch system.
Why Shackle Thickness Matters
A typical 30mm padlock has a shackle thickness of around 5mm. On cam latch lockers, this is not enough to block the rotation. The latch can still be forced to move, which opens the locker.
For a cam latch to be properly secured, the padlock shackle must be at least 6mm thick. Most 40mm padlocks meet this requirement, but always double-check the shackle diameter in the specifications.
Recommended Padlock Size For Cam Latches
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Minimum shackle thickness: 6mm
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Typical padlock body size: 40mm
This prevents the latch from turning and ensures the locker is fully locked.
When Buying In Bulk
Schools, gyms, leisure centres, and workplaces often look for the cheapest 30mm padlocks available. That works well for hasp-and-staple lockers, but for cam latches it will result in:
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Lockers not actually being secure
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Keys breaking due to extra forcing
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Increased maintenance and replacement costs
Spending slightly more on the correct 40mm padlock prevents these issues.
Conclusion
If your lockers use cam latches, always choose a padlock with a shackle thickness of 6mm or more. For hasp-and-staple fittings, a 30mm padlock will usually be sufficient.