What is a master key lock?

Question

These master-keyed locks are configured to operate with two, or more, different keys: one specific to each lock (the change key), which cannot operate any of the others in the set, and the master key, which operates all the locks in the set.

How do you tell if a key is a master key?

Any key that operates two or more unique locks can be called a master key. A master key will look like any other key within a master key system. It will be the same size and same basic shape. Only the cuts will differentiate it, unless it is stamped with identifying alphanumeric characters, like “GGM” or “GM” or “A”.

Can a master key open any lock?

Master key: The master key can open all locks you have in your residential or commercial property.

Why do they call it a master key?

The term derives from the fact that the key has been reduced to its essential parts. The term is also used synonymously with master key to refer to any key, keycard or other device capable of opening a variety of locks.

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