How to Switch Filing Cabinet Lock Cores

Periodically replacing your file cabinet lock core may be a prudent security precaution if you work in a busy office, and it isn't difficult to do. The process is more graceful if the old lock is open or, if it isn't, if you still have the key. Otherwise, you may need to drill out the old core, which will destroy it. In most cases, you need a wrench or pliers to make the switch, but some manufacturers make cores that you can switch with a special key. This makes it easier to switch them frequently.


Open the top drawer of the filing cabinet so you can access the lock core. It's usually to the upper right of the top drawer. Remove the drawer to give yourself room to work.


Make sure the core is in the unlocked position and inspect the back to determine how it's affixed. If it has a clip, grip the clip with needle-nose pliers and pull it off. If it's affixed with a hex nut, loosen and remove the nut with a wrench.


Pull the core straight out and insert the new core in the hole. The new core must be in the unlocked position, or you won't be able to get it in the hole.


Grip the clip with needle-nose pliers and push it into the grooves of the new core to hold the core in place. If the core is the threaded type, screw on the retaining nut and tighten it with a wrench.


Close the door and test the lock.