Broken Key Stuck in the Ignition or Door Lock

If your key just snapped off in the ignition or a door lock, do three things: stop turning, keep the half in your hand, and never reach for superglue. In most cases a locksmith can extract the broken piece without damaging the lock, and can cut you a fresh key from the two halves in the same visit.

Keys rarely snap without warning. The brass fatigues, the lock gets stiff, and one hurried twist finishes the job. Here is what to do right now, what will make things worse, and what actually happens when the van arrives.

The first minute: what to do

Stop turning immediately. Torque is what snapped the key, and more torque wedges the broken piece deeper against the wafers. If a stub is sticking out of the keyway, leave it exactly where it is; a protruding piece is the easiest kind to extract.

Pocket the half still in your hand, because it is needed later to make the new key. Note the ignition position too. If the key broke with the ignition switched on or the car in accessory mode, mention that when you call, since it changes how the cylinder has to be handled. Then step away from the lock. The job is already as easy as it is going to get.

What not to do, starting with superglue

The internet's favorite trick is dabbing superglue on the broken stub to pull the piece out. Do not. Glue wicks into the wafer chambers and cements the moving parts of the cylinder in place. A five-minute extraction becomes a full lock replacement, and glue is the single most common way a small job turns into a big one.

Also skip:

• Tweezers. Keyways are narrower than tweezer tips. Most attempts push the piece deeper.
• Paperclips, bobby pins, screwdrivers. Same result, plus scratched wafers.
• Magnets. Many key blanks barely respond, and the lock body blocks the pull.
• Drilling. That is not extraction, that is destroying the lock.

How professional extraction works

Extraction tools are thin hooked and spiral picks, thinner than the key itself, that slide into the keyway alongside the broken piece. The hook rides the bitting, the jagged cuts along the key's edge, catches the first tooth, and draws the piece straight out along the path it went in. A touch of lubricant helps everything move.

For deep breaks in an ignition, the locksmith may remove the cylinder from the column to work on it directly. Either way, once tools are out, most extractions take minutes. It is a core part of mobile broken key extraction work: the van comes to the car, not the other way around.

Will the lock survive?

Usually, yes. A clean break that gets professionally extracted leaves the cylinder exactly as it was. Nothing about a proper extraction wears the lock.

The honest caveat: keys often snap because the lock was already failing. A dry, worn cylinder drags on the key, you twist harder to compensate, and the brass gives. If that is the story, the extraction fixes the symptom and the worn cylinder remains. A good locksmith will turn the lock with the new key after extraction, feel for that drag, and tell you plainly whether the cylinder is healthy or living on borrowed time.

A new key from the broken halves

Put both halves together and the full set of cuts is there to read. A locksmith decodes those cuts and machines a brand-new key, and the better shops cut to factory specification rather than tracing the worn profile, so the new key works like the original did when the car was new.

If your key has a transponder chip, useful news: the chip lives in the plastic head, which is usually the half still in your hand. An intact chip can often be reused or its data carried into the replacement, which simplifies programming. And if part of the key is lost entirely, the cuts can still be recovered from your VIN or decoded from the lock itself.

Why keys snap, and how not to repeat it

Three causes account for nearly every broken key. First, metal fatigue: keys are brass, and decades of turning create invisible stress cracks. Second, a stiff or dying lock that demands more twist every month. Third, using the key as a tool, opening boxes and prying lids.

Prevention follows directly. Replace visibly worn, thinned keys before they fail. Treat a lock that needs jiggling or force as a warning, not a quirk; our guide on an ignition that will not turn covers what that stiffness means. And carry the spare once a key starts looking tired.

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