![]() ![]() 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. In the trade, a master key may be shortened to ‘MK’. In some systems, this will be the highest ranking key. This is the necessary key to change a simple lock into a master keyed lock. Master Key – Without a master key, there is only one key for a lock. The lock that the change key opens will 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. Keys in a Master SystemĬhange Key – This key is also referred to as a sub-master key. With the basic understanding, one should be able to extrapolate potential additions to the system’s security. After reading this piece, you should be able to understand any master key system, varying from the simplest version to the most complex. At the lowest level of comprehension it is addition and subtraction, and at the highest level of understanding (at least what is expressed here) it is exponents. ![]() Now before you stop reading (I may have lost some people already) it is nothing too difficult. How is one key, opening two doors, but another key that is opening one of those doors is not opening the other? Is it the key that is special? Is it the internal mechanics of the lock? Well, I must warn you that there is some math involved in these answers. The fascination, I believe, is due to the confusing nature of the device. Master keys are something that many people seem to be fascinated with. ![]()
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