Deadlatching: Installed on Most Locks, Working on How Many?
Most modern latch locks come with a deadlatching function — a security feature designed to stop the lock from being slipped open with a credit card.
But here’s the catch: deadlatching only works if the lock and door are installed correctly.
And in the real world, that’s not always the case.
What Is Deadlatching?
Deadlatching is a mechanism that prevents the latch from being pushed back once the door is closed.
It works using a secondary pin, called the deadlatch pin, which sits beside the main latch tongue.
When the door closes properly:
The deadlatch pin rests on the strike plate
This locks the main latch in place
Prevents anyone from sliding a card or tool in to push the latch back
But if the deadlatch pin doesn’t engage properly — or worse, drops into the strike hole — the latch can be bypassed just like an old-style spring latch.
Common Installation Issues
Most locks have the deadlatching feature, but that doesn’t mean it’s working.
Here’s where things go wrong:
Strike plate is too deep
Door doesn't close in the right position
Rubber seals or warped frames create movement after closing
Lock is installed on a door it’s not suited for
These issues can silently disable the deadlatch — leaving you with the illusion of security.
The “Two-Position” Test
This quick DIY check can reveal if your deadlatch is working or not:
Close your door gently.
The door feels shut but still has a tiny bit of movement.
✅ This is usually correct — the deadlatch pin is resting on the strike plate.
Now push the door firmly.
Hear a small click? Feel it "tighten"?
❌ That’s the deadlatch dropping into the strike hole, which defeats its function.
This usually happens due to:
Door movement caused by seals
Poor alignment
Loose or deep strike plate
Even After Closing, the Deadlatch Can Still Fail
Even if your door closes gently into the correct position, someone outside could pull on the door slightly, shift it just enough, and cause the deadlatch to fall into the strike hole.
Once that happens, the lock becomes credit-cardable — despite looking secure.
The Fix: Only One Closing Position
The solution is simple but critical:
✅ Your door should close into only one solid position — where the deadlatch pin stays pressed against the strike plate and never drops in.
To ensure this, you may need to:
Adjust or shim the strike plate
Remove pressure from rubber seals
Realign the door or lock hardware
Final Thoughts
Most locks sold today come with deadlatching.
But how many are actually working as intended?
If your door closes in multiple positions or feels loose, it might be worth having it checked.
Because having deadlatching means nothing — unless it's working.