Key Broke Off in the Lock? Here Is What to Do
A snapped key is recoverable far more often than people think, as long as the next ten minutes are handled correctly.
Written by the Locksmith Vaughan Ontario team, a mobile locksmith service covering Vaughan and the surrounding GTA. Last reviewed .
A key snapping off in a lock is one of those failures that feels catastrophic and usually is not. In most cases the broken piece comes out, the lock survives, and you get a new key. What determines whether it stays a small job or turns into a replaced lock is almost entirely what happens in the first ten minutes.
Why keys break
Keys rarely snap without warning. Metal fatigues gradually, so the key that broke today has usually been getting harder to turn for weeks. The common causes are a worn key that has been copied from a copy, a lock that is dry or full of grit, a door that has dropped slightly so the bolt binds against the strike plate, and cold weather, which makes tired metal more brittle. If your key has needed jiggling lately, that is the warning.
What to do right now
- Stop turning anything, because forcing the remaining stub can push it deeper or damage the pins
- Leave the lock in the position it is in rather than trying to rotate the cylinder back
- If part of the key is sticking out and you can grip it with fine pliers, pull it straight out with no twisting
- If nothing protrudes, leave it and call a locksmith, because this is a routine extraction for the right tools
What makes it much worse
Superglue is the classic mistake. The idea of gluing the broken half to the stub and pulling it out seems clever, and it reliably destroys the lock by bonding the fragment to the pins. Nearly as bad is jamming in another key to push the piece through, which usually drives it deeper and can bend the pins. Drilling should never be your own first move either, since it guarantees the lock needs replacing when extraction would probably have saved it.
Can the lock be saved?
Usually, yes. A clean extraction leaves the cylinder intact, and the locksmith can then cut you a fresh key from the lock itself or from the recovered pieces. This is also the ideal moment to rekey, because if the key was that worn, the other copies are likely in similar condition. When the lock does need replacing, it is normally because the cylinder was already failing, which is what caused the break in the first place.
Broken key in a car ignition
The same rules apply, with one addition: do not try to start the car or force the ignition cylinder to rotate, because ignition components are more delicate and considerably more expensive than a door lock. For vehicles, extraction and cutting a replacement key usually happen together at your location, since programming needs the car present anyway.
Preventing the next one
Retire visibly worn keys before they fail, and cut new copies from an original rather than from another copy, since each generation loses precision. Keep locks lubricated with a proper graphite or dry lubricant instead of oil, which attracts grit. And if a door needs lifting or leaning to lock, fix the alignment, because that resistance is what fatigues the key.
