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How Pin Tumbler Locks Work

How pin tumbler locks work explained with simple animation. See what happens inside a door lock when you insert and turn a key.Learn how normal keys and master keys open the same lock. Every time you use a key, a precise mechanical system moves inside the lock — even though we never see it. In this video, you’ll see a clear, animated explanation of how a pin tumbler lock works. We show the main parts of a lock, including the case, plug, springs, driver pins, and key pins, and how they line up at the shear line to let the lock turn. You’ll also learn how master keys work. By adding an extra master pin, the lock can be opened by both a normal key and a master key. Watch how the pins align differently but still allow the plug to rotate and open the door. This video is made to be easy to understand, with simple language and clean visuals — perfect for anyone curious about how everyday locks work. If you enjoyed this explanation, check out my next video where I break down how door handles work inside. Subscribe for more simple animations and clear explanations of everyday mechanisms.