What is the difference between a master key and a grand master key?

What is a grandmaster key?

Definition of grandmaster key : a master key designed to fit a number of different master-keyed systems of locks.

How many different master keys are there?

Of those 32 possible keys, only two keys need to be made. One will be for the person with access to what that lock is securing, and another for the person that has access to what every lock is securing in the location.

Can a master key open any door?

Master keys and change keys When lock rekeying into a master key system, two keys are created: Change key: This key can open the master lock, but only the master lock. It cannot be used inside any other locks you have. Master key: The master key can open all locks you have in your residential or commercial property.

Are all Master Lock keys different?

In a Master Keyed system, a master key opens all the locks in the system although each lock also has its own unique key.