What is a master key system?

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A master key system is a set of cylinders in which one master key opens several locks, while each individual key opens only its own.

For example, in a community of owners: each resident opens their storeroom with their own key, and the caretaker or the property manager has a master key that opens all the communal rooms. In an office, each employee opens their own room and the person in charge opens everything.

Several levels can be set up: a general key, others that open just one floor or one area, and the individual ones.

It should not be confused with keying alike, where all the keys are the same and open every door. In a master key system each key has its own permissions. It is explained in master key systems.

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Master key systems

Master key systems for communities, rental properties and businesses, where each key opens only the doors it is meant to.

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Other questions on this topic

What do the security grades of a lock cylinder mean?

They are the classifications in the UNE-EN 1303 standard, showing how secure the key is and how well the cylinder withstands attack. The higher the grade, the more protection. Read the full answer

Can a lever lock be changed for a cylinder lock?

Yes. Many doors with an old lever lock can be converted to a European cylinder, which is more secure and lets you choose the level of protection. Read the full answer

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Lock cylinders

Everything people usually ask about the lock cylinder: when to change it, how to measure it, what protection it has and how to look after it on the coast.

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