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First, it's important to note that not all keys are made of brass. Keys can be made from any material that is strong enough to release the mechanism of a lock. For the mass production of modern locks, which is what I believe the question is referring to, brass is used for making keys because it is the least expensive metal that is strong enough to turn the mechanism inside the lock.

Simply put; brass is cheap and it works well in any human environment. Cheaper alternatives like tin or copper (which are combined to make brass) bend or break too easily to make them reliable, and stronger alternatives like iron and steel are too expensive.

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13y ago

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