The key pins will be different sizes with accordance to the cuts of the Change keys and Master Keys, all the driver pins will be the same size. How Master Keys Workīasic pin tumbler locks open by raising the key pins so that the driver pin is above the sheer line and the key pin is below. This can continue further with a grand grand master key and on and on. Great Grand Master Key – The great grand master key will open all the grand master key systems under it, the master key systems under those, and the change keys under those. In the trade, a master key may be shortened to ‘GMK’. This key will open every master system under it, and the subsequent change keys under those systems. Grand Master Key – A grand master key is used to access multiple master key systems. Master Key – The Master Key sometimes referred to “MK” this key will work all change keys that fall under it in the system.
The lock that the change key opens can also open with the use of the master key, and any key above that rank. It will open one lock and only locks that are exactly the same. No key except the SKD will work this door example might be a HR office.Ĭhange Key – This key is also referred to as a sub-master key. Sometimes you want a door that is not keyed to your master-key system for security reasons. SKD – This denotes a Single Keyed Different cylinder. How is one key opening two doors but another key can only open one of those doors? After Reading this you should have a better understanding on how a master key system works. Master Keys are used by many people and businesses but not many understand how they actually work.
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