Why is it called master key?

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.

What is a master key?

A master key is a key that opens several different locks, related in some way, within a master key system. For example, an elementary school may have a master key which will open all classroom doors. Classroom doors would each also be opened by a key which would only open that one classroom door.

What makes a master key a master?

Any key that can open two or more locks is considered a master key. Many master keys use pin and tumbler locks. For a master key to work, though, there must be something called master wafers inside the lock. When the master wafers line up, the key and lock can turn freely.

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

The change key will open only that specific lock, while the master key will open that lock and several others in a group. In these locks, a few of the pin pairs are separated by a third pin.