Master key or master keying is the capability to use one "Master" key to open one or more locks that are not actually keyed the same. A master key system uses security key blanks that are precisely designed keys which could only be duplicated only from a locksmith who created the system.

Master keys are usually being used by apartment owners where they can open each door of their rented rooms/flats, and at the same time, each occupant also possess a key to their own unit. Tenants's key may also be used to access the main door of the building along with other areas accessible to renters. It cannot be used to open another unit.

Multiple master, grand master, and sub master keys may be involved in the master key system making it a complex system. You need a master key if you do not want to keep a lot of keys for a lot of doors.

Depending on your key holder, we are sure to make the proper master key systems. When in an urgent locksmith emergency trouble, make sure to call our locksmiths at our emergency hotline number. Our customer support is available 247.