Padlock key broken off inside the lock

Symptoms

• Key snapped while turning
• Broken key stub visible in the keyhole
• Lock won't open with the remaining key piece or a spare
• Key felt stiff before it broke

Likely causes

• CommonKey was worn thin or already had a hairline crackOld, worn keys are more brittle and prone to snapping under torque.
• CommonLock mechanism was stiff, requiring excess force to turnForcing a stiff lock puts extra stress on the key blade.
• PossibleWrong or damaged key used repeatedly, weakening itA key that doesn't fit quite right can bend and fatigue over time.
• Less commonExtreme cold made the key brittleMetal keys can become more brittle in very cold conditions.

What to do

1. Don't insert anything metal and force it in beside the broken piece, since this can push it in deeper.
2. Apply a few drops of penetrating oil or lubricant around the stub to reduce friction.
3. Try to grip the protruding piece with needle-nose pliers or tweezers if any of it sticks out, and pull straight out.
4. If nothing protrudes, a thin broken-key extractor tool (inexpensive and sold online) can be inserted alongside the stub to hook and pull it out.
5. Tapping the lock gently while trying extraction can help dislodge a stuck fragment.
6. If extraction isn't possible, the lock will need to be cut off or drilled by you or a locksmith, and a spare key elsewhere won't help until the broken piece is out.

Tools and parts

• Needle-nose pliers or tweezers
• Broken key extractor tool
• Penetrating oil

When to call a pro

A locksmith has specialized tools to extract a broken key or replace the lock cleanly if extraction fails.

Safety