How come Key A can open Lock A. Key B can open Lock B. But not lock A. And key C can open all the locks? Doesn’t that mean A and B should be able to open each other?
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All keys are cut to specific code numbers. Imagine a master key having the key cut to code 76765. All the locks can have their unique variations, but with an added pin combination that totals 76765 (your master key code).
Pins inside the cylinder number in length from 1 to 7 typically, but you can switch pin combinations up to total that master code. Code 34543 for the regular room key, just add master pins (two different types of pins are used for master keys) 42222 and you can have two keys open one lock. With more variances, you just add master pins to all the codes you’ve created to total 76765, and your master key will work with many locks.
Side note, don’t use a difference of just 1. That master pin 1 is so thin and tends to gets jammed.
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