How are all locks/keys different when mass produced?

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Recently moved to a gym that uses padlocks for locking your stuff, they sell them too for an inflated price of 3.5$, jokingly I tried my key on a friend’s lock, and one more random one, of course it didn’t work and it made me curious.

My question is how do factories make all keys/locks different even at these cheap mass produced kinds that are probably sold for 0.5-2$, how is it worth for a factory to “use different patterns” at that price, or how do they do it?

In: Engineering

37 Answers

Anonymous 0 Comments

Standard keys were used for cars as well up until about a couple of decades ago. I remember 2 of my friends had similar cars, and the door keys unlocked each other’s doors, but the engine keys were different and did not swap.

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