A key snapping inside a door lock can be frustrating, particularly when you're trying to get into your home, secure a business premises or lock up at the end of the day. Although a broken key may look like a serious problem, it doesn't always mean the entire lock needs replacing.
In many cases, a locksmith can remove the broken section without damaging the cylinder. However, attempting to force the key out using unsuitable tools can make the situation considerably worse.
In this guide, Garrison Locks explains what to do when a key snaps in a lock, the safest ways to deal with a broken key, why keys break and when you should consider replacing the lock cylinder.
Why Do Keys Snap Inside Locks?
Keys are subjected to repeated wear every time they are inserted, turned or removed from a lock.
Over time, the metal can weaken, particularly around the cuts and narrow sections of the key blade.
Common reasons for a key snapping include:
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Worn or damaged keys: Years of use can weaken the key blade, making it more likely to break under pressure.
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Stiff or faulty locks: Worn internal components, contamination or a damaged cylinder can increase the force needed to turn the key.
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Misaligned doors: A dropped UPVC or composite door can place additional pressure on the multipoint locking mechanism.
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Poorly cut replacement keys: An inaccurate duplicate may not operate the lock smoothly.
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Excessive force: Twisting a key when the lock is resisting movement can cause the blade to fracture.
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Bent keys: A key that has already been bent or damaged is more vulnerable to breaking.
If a key becomes difficult to turn, this is often an early warning that something needs attention. Continuing to force it can result in a broken key or further damage to the locking mechanism.
What Should You Do Immediately If a Key Breaks in a Lock?
The most important thing is not to force the lock or push the broken key further inside.
Before attempting to remove anything, assess the situation.
1. Stop Turning the Lock
If the key has snapped while being turned, avoid trying to operate the cylinder with the remaining piece.
Additional force may move the broken section deeper into the keyway or damage the internal components.
2. Check Whether the Broken Key Is Visible
Look carefully at the entrance to the keyway.
If part of the broken blade is protruding, removal may be relatively straightforward.
If the fragment is completely inside the cylinder, specialist extraction tools may be required.
3. Check the Position of the Cylinder
A broken key may be more difficult to extract if the cylinder plug has been left partially turned.
Professional extraction is generally easier when the plug is returned to its normal key-removal position, but this should not be attempted by forcing the remaining fragment.
4. Avoid Using Excessive Force
Do not insert another key, screwdriver or improvised tool in an attempt to push the broken section through the lock.
Doing so can damage the cylinder or wedge the fragment more securely inside.
If the door is locked and you cannot gain access, contacting a qualified locksmith is usually the safest option.
How to Remove a Broken Key from a Lock
The appropriate removal method depends on how much of the key remains visible, the type of cylinder and whether the lock has been damaged.
Method 1: Removing a Protruding Key with Pliers
If a sufficient length of the broken key is sticking out of the lock, it may be possible to remove it using a pair of fine-nosed pliers.
Carefully grip the exposed section and pull it straight out, keeping the blade aligned with the keyway.
Avoid twisting, bending or pulling at an angle.
If the fragment does not move with gentle pressure, stop rather than risk breaking it further.
Method 2: Using a Broken Key Extractor
Professional locksmiths use specially designed broken-key extraction tools to remove fragments from lock cylinders.
These tools are designed to engage with the broken blade so it can be withdrawn from the keyway.
Broken key extractors are available in different designs and sizes, depending on the type of lock and key profile.
However, using the wrong extractor or inserting it incorrectly can damage internal components or push the fragment deeper into the cylinder.
For a fragment that is completely inside the lock, professional removal is generally the better option.
Method 3: Removing the Cylinder
Where a door is already open and the cylinder can be removed normally, a locksmith may choose to remove it to make extraction easier.
This can provide better access for inspection and specialist tools.
However, removing a euro cylinder from a UPVC or composite door does not automatically release the broken key.
If the cylinder is damaged, badly worn or cannot be restored to reliable operation, replacement may be more practical.
What Should You Avoid When a Key Snaps?
Several commonly suggested DIY methods can cause more damage than they solve.
Do Not Use Superglue
You may find online advice suggesting that glue can be applied to the broken end of a key to pull the fragment out.
We do not recommend this method.
Glue can enter the cylinder and bond internal components together, potentially turning a straightforward key extraction into a complete lock replacement.
Do Not Force Another Key into the Lock
Inserting another key behind the broken fragment is unlikely to solve the problem and may push the broken piece further inside.
Do Not Use Excessive Lubricant
Flooding the cylinder with oil or unsuitable lubricant can attract dirt or interfere with the lock mechanism.
Only use a lubricant approved by the lock manufacturer, and remember that lubrication will not repair a damaged cylinder.
Do Not Drill the Lock Unnecessarily
Drilling is a destructive procedure and should not be the first response to a broken key.
A competent locksmith will normally assess whether the fragment can be extracted before considering destructive methods.
What If a Key Snaps in a UPVC Door Lock?
UPVC and composite doors commonly use euro profile cylinders as part of a multipoint locking system.
If a key snaps inside one of these cylinders, the problem may be caused by the key itself, the cylinder or resistance elsewhere in the door mechanism.
For example, if the door has dropped slightly or the locking points are not aligning correctly with the keeps, additional force may be required to operate the handle and key.
Over time, this can place unnecessary strain on the cylinder and key.
If a key has snapped in a UPVC door lock, it is important to check whether the underlying problem is caused by:
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A worn euro cylinder.
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A damaged or poorly cut key.
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A misaligned door.
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A stiff multipoint locking mechanism.
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Worn hinges or incorrectly adjusted keeps.
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A fault within the lock gearbox.
Simply replacing the cylinder may not resolve the issue if the door or multipoint mechanism is responsible.
Garrison Locks supplies replacement euro cylinders and multipoint locking products for a wide range of domestic and commercial applications.
Can a Broken Key Be Removed Without Replacing the Lock?
Yes. In many cases, a broken key can be extracted without replacing the cylinder.
If the lock is otherwise in good condition and operates correctly after the fragment has been removed, replacement may not be necessary.
However, a replacement cylinder should be considered where:
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The keyway or internal mechanism has been damaged.
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The lock was already difficult to operate.
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The cylinder shows signs of excessive wear.
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The original key broke because of an underlying cylinder fault.
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The existing lock offers inadequate security.
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Reliable operation cannot be restored.
A broken key can also provide an opportunity to review the security of an older door cylinder.
For external doors, consider whether an appropriately certified anti-snap euro cylinder would offer a worthwhile security improvement.
Should You Upgrade to an Anti-Snap Euro Cylinder?
If your existing euro cylinder needs replacing, it may be worth upgrading to a higher-security model.
Many older or basic euro cylinders provide limited protection against common forms of physical attack.
Depending on the door and security requirements, suitable replacement products may include cylinders certified to:
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TS007 3 Star: A security classification used for cylinders offering enhanced resistance to specified attack methods. View our Police and Insurance approved Mul-T-Lock cylinder range
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Sold Secure SS312 Diamond: A recognised certification for cylinders tested against defined attack methods.
Check the current certification and compatibility of any product before purchasing.
High-security cylinders are available in different lengths, finishes and key systems, including options for keyed alike arrangements and restricted key control.
Garrison Locks supplies a range of euro profile cylinders, anti-snap cylinders and Mul-T-Lock high-security locking products for domestic and commercial applications.
How to Measure a Replacement Euro Cylinder
If your broken key has resulted in the need for a new cylinder, selecting the correct size is essential.
Euro cylinders are normally measured from the centre of the fixing screw hole to each end of the cylinder.
For example, a cylinder measuring 35mm on one side and 45mm on the other would be described as a 35/45mm euro cylinder.
The measurements may be different on each side, depending on the door thickness and the position of the lock case.
When ordering a replacement:
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Measure from the centre of the fixing screw hole to the outside end of the cylinder.
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Repeat the measurement for the inside end.
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Check whether the cylinder has a key operation on both sides or a thumbturn.
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Confirm the required finish and security specification.
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Ensure the replacement does not project excessively beyond the protective door furniture.
A correctly sized cylinder is important for both reliable operation and security. Read our How to measure a cylinder guide for professional help.
When Should You Call a Professional Locksmith?
Although a protruding key fragment may sometimes be removed without specialist equipment, certain situations are best handled by a qualified locksmith.
Professional assistance is recommended when:
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The broken key is completely inside the cylinder.
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The door is locked and cannot be opened.
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The key snapped while the cylinder was partially turned.
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The lock was already stiff or faulty.
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Previous extraction attempts have failed.
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The cylinder or multipoint mechanism may be damaged.
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The door forms part of an important access or emergency escape arrangement.
A locksmith can assess the condition of the lock, attempt non-destructive extraction and advise whether replacement components are necessary. Remember, always use a MLA (Master Locksmiths Approved) locksmith.
How to Prevent Keys from Snapping in the Future
Preventative maintenance can help reduce the risk of broken keys and premature lock failure.
Replace Worn or Bent Keys
Inspect frequently used keys for bending, cracks and excessive wear.
If a key is visibly damaged or difficult to insert, arrange for a correctly cut replacement before it breaks.
Never Force a Stiff Lock
A key should operate smoothly under normal conditions.
If additional force is regularly required, investigate the cause rather than continuing to use the lock.
Check Door Alignment
UPVC and composite doors can move over time because of wear, temperature changes or hinge adjustment.
Poor alignment can place unnecessary strain on the multipoint locking mechanism.
Maintain the Lock Correctly
Follow the manufacturer's maintenance recommendations and use only suitable cleaning or lubrication products.
Use Properly Cut Replacement Keys
Poorly cut duplicates can cause operating problems and accelerate wear.
For restricted or high-security key systems, replacement keys may need to be ordered through an authorised supplier.
Replacement Locks, Cylinders and Keys from Garrison Locks
If your key has snapped because of a worn or damaged cylinder, Garrison Locks offers a wide range of replacement locking products for domestic, commercial and professional use.
Our product range includes:
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Euro profile cylinders.
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Anti-snap and high-security cylinders.
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Mul-T-Lock cylinders and key systems.
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UPVC multipoint locking mechanisms.
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Replacement door locks and locking hardware.
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Specialist locksmith tools and accessories.
Whether you are replacing a faulty cylinder or upgrading your existing security, it is important to select a product that matches your door, lock mechanism and security requirements.
Browse our range of replacement cylinders, door locks and locksmith products to find the correct solution.
Frequently Asked Questions
Can I get a broken key out of a lock myself?
If part of the key is protruding, it may be possible to remove it carefully with fine-nosed pliers. If the fragment is fully inside the cylinder, professional extraction is usually safer.
Will a broken key damage the lock?
Not necessarily. Many broken keys can be removed without permanent damage. However, forcing the fragment, using glue or inserting unsuitable tools can damage the cylinder.
Does a snapped key mean I need a new lock?
No. If the fragment can be removed and the cylinder remains in good working condition, replacement may not be required.
Can a locksmith remove a broken key without drilling?
Often, yes. Locksmiths have specialist extraction tools and may be able to remove the broken blade without destructive work. Success depends on the condition and position of the fragment.
Why does my key keep getting stuck in the door?
Possible causes include a worn cylinder, damaged key, door misalignment or a faulty multipoint locking mechanism. The underlying cause should be identified before further damage occurs.
Can I order a replacement key from the broken pieces?
In some cases, a locksmith or key-cutting specialist may be able to identify and reproduce the original key from the remaining pieces. For restricted or patented key systems, an authorised key supplier and appropriate identification or key registration details may be required.
Final Advice
A key snapping inside a lock does not always mean the lock is beyond repair.
The most important thing is to avoid forcing the broken fragment or attempting removal with unsuitable tools.
Where the broken section is easily accessible, careful extraction may be possible. For fragments trapped inside the cylinder, professional locksmith assistance is generally the safest approach.
If the cylinder is worn, damaged or difficult to operate, replacing it with a correctly sized, suitable security cylinder can help restore reliable operation and improve door security.
Need Advice? Contact Garrison Locks
At Garrison Locks, we have over 35 years of experience in the locksmith and security industry. Whether you need help choosing a replacement cylinder, checking lock compatibility or sourcing specialist security products, our knowledgeable team is here to help.
Garrison Locks Ltd
Telephone: 01858 464 133
Email: enquiries@garrisonlocks.co.uk
Website: https://garrisonlocks.co.uk
Garrison Locks – Your UK Specialist in Security, Locks & Access Solutions.
