Steelcase filing cabinets provide owners reliable security to protect important files and folders. They do so using thick metal locks, requiring a key to open the drawer containing the documents. If the lock is beginning to rust though, or you are worried someone else has a copy of the key, you should replace the lock. Note that you need to have the drawer open to do this; if you have lost your key and the drawer is locked, you will need to contact a locksmith.
Unlock and open the Steelcase filing cabinet drawer for which you want to replace the lock. Some cabinets have only one locking drawer; others have multiple.
Unscrew the screw on the inside of the lock. You will see it right in the centre of the lock core (which is a little bigger than your thumbail). This will remove the movable locking arm from the lock core.
Grasp the ring around the lock on the inside of the cabinet with a monkey wrench.
Turn the wrench counterclockwise to loosen the ring fastening the core to the cabinet.
Remove the core once it is loose enough to wiggle out. Having removed the arm, this will now come out in one piece.
Push the new core into the now-empty socket. Tighten the ring around the core by turning the wrench clockwise.
Screw in the screw that connects the locking arm back onto the new core.