Broken Key Extraction From Door Locks

If a clear portion of the key is sticking out and it slides out with gentle, straight pulling, it may come free. Stop if it does not move easily. Gripping the stub with pliers can crush it, and tweezers tend to slip and push it deeper. Avoid super glue, pins and knives; glue can bond the key to the pins, and sharp tools can damage the keyway. A fragment that stays near the face of the cylinder is much easier for a technician to remove than one that has been pushed further inside.

Not always. If the fragment comes out cleanly and the cylinder is not damaged, the lock can often return to service with a new key. Replacement becomes likely if the cylinder was already worn, if the fragment has damaged the plug or pins, or if extraction requires cutting the cylinder. The technician should explain what they find once the key is out. Ask to test the lock with a working key before deciding. A cylinder that turns smoothly after extraction does not need to be changed.

It can be. When the plug is turned away from its neutral position, the fragment is held more firmly, and it may need to be rotated back before it will release. In some cases the cylinder must be removed and disassembled to reach the piece. Tell us whether the lock was locked or unlocked at the time and what position the key was in. That information helps the technician plan the work and give a clearer idea of the likely approach and cost before arriving.

Keys usually fail after gradual stress rather than a single event. A worn key, a stiff cylinder, a bolt dragging against the strike and using the key to pull the door all contribute. Copies cut from worn keys or made on thin blanks break more easily. If the lock had become harder to turn before the key failed, the underlying problem is still there. Addressing the cylinder or the door alignment after extraction prevents the next key from breaking in the same way.

Often, yes. If both halves are available and the cuts are intact, a key can usually be decoded and duplicated. Where the key is badly worn, cutting to the lock's original specification may produce a better key than copying the worn one. Restricted and high-security keys may be available only through the system supplier with proper authorization. Bring every piece of the broken key and any spare you have. The technician can explain which option produces a key that operates the lock reliably.

The technician will first confirm that you are authorized to enter the property. They will then try to remove the fragment and operate the lock. If that is not practical, another entry approach may be needed. If you can reach the inside through another door, mention it, because removing the cylinder from inside can simplify the work. The lockout pages describe what to expect during entry. Any repair or replacement after entry should be priced and agreed separately.

Usually, though the approach depends on the lock. Padlocks and mailbox cam locks are small and often weathered, so the cylinder may be worn or corroded. For a mailbox, confirm who is responsible for the lock; Canada Post community mailboxes and building mailboxes have their own arrangements. The mailbox lockout page explains those responsibilities. For a padlock, replacement is sometimes more practical than extraction if the lock is inexpensive or damaged.

A dry lubricant made for locks, such as graphite or a PTFE product, is generally appropriate for pin-tumbler cylinders. Avoid heavy oils and general-purpose sprays, which attract dirt and can gum up the pins over time. Do not spray anything into an electronic lock housing. Lubricant alone rarely removes a broken key, and too much can make extraction tools slip. If the lock was stiff before the key broke, mention it to the technician, who can service the cylinder after the fragment is out.