A master key system allows two or more keys to open one lock.
Master key locks.
Find your key number.
The change key will open only that specific lock while the master key will open that lock and several others in a group.
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Master lock is recognized around the world as the authentic enduring name in locks combination padlocks and security products.
The basic pin tumbler master locks use a master wafer pin in between the key pin and the driver pin.
For example this key number is 3900.
Your key number can be found on the back of your key or on the original packaging.
Some locks are designed to work with two different keys.
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In these locks a few of the pin pairs are separated by a third pin this third pin is called a master wafer or spacer.
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To make a master key system you need locks and keys that are the same make and model and a way to rekey those locks.
It is only possible to obtain a replacement key from master lock if you have the key number.