Most people think keys are made from hard steel and last forever.
In reality, many residential keys are made from softer metals like brass so they can be cut easily and work smoothly inside locks.
Over years of use, tiny amounts of metal slowly wear away. Eventually those small changes can affect how the key interacts with the pins inside the lock.
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Why Keys Wear Out
Keys wear out because every time a key slides into a lock and turns, metal rubs against metal.
Most residential keys are made from brass or softer metal alloys because they are easier to cut and create less wear on the lock itself.
Over thousands of uses, tiny amounts of material slowly disappear from the peaks and valleys of the key. The changes are usually too small to see with your eyes, but inside a lock those tiny differences matter.
Eventually the key may begin sticking, become inconsistent, or stop working altogether.
Signs Your Key May Be Wearing Out
- The key works sometimes but not every time
- You have to jiggle the key
- The key sticks during insertion or removal
- You need extra force to turn the lock
- A spare key works better than the original
Can a Worn Key Be Fixed?
Sometimes the easiest fix is simply cutting a fresh key from the original key code or from a less-worn spare key.
If the lock itself has also developed wear, a locksmith may recommend rekeying, repairing worn components, or replacing damaged hardware.
Many people assume the lock has failed when the real problem is simply years of gradual wear on the key itself.
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