Why Keys Break
Worn Keys and Stiff Locks Usually Cause the Problem
A broken key is often the result of a lock that has been warning you for a while. The key may already be worn, slightly bent, or cut from an older copy. The lock may be sticky, misaligned, dry, or harder to turn than it should be. When those two problems meet, the key can snap inside the cylinder with almost no warning.
- Old or worn house keys that have weakened over time
- Locks that are sticky, dry, or hard to turn
- Door alignment problems that put extra pressure on the key
- Keys forced after the lock already started binding
- Bad duplicate keys that do not match the cylinder correctly