Components & reference points
Latch bolt
The latch bolt is the moving component, often beveled and spring-assisted, which maintains the door closed when it reaches the strike plate. The handle typically allows for retraction of the bolt.
THE KEY POINT TO REMEMBER
A door that has clicked shut is not necessarily locked with a key.
What happens when the door closes
The rebate meets the strike plate and pushes the bolt into the housing. When the door reaches its closed position, the spring pushes the bolt back into its receiving slot.
To open the door again, the handle operates the mechanism and retracts the latch bolt. Some locks also allow the key to do this.
Latch bolt or deadbolt?
The latch bolt primarily holds the door closed. The deadbolt secures it when operated by the intended control, usually a key or thumbturn.
The French term “demi-tour”, literally “half-turn”, does not mean that the bolt rotates 180 degrees each time the door opens. On common models, it slides in and out.
Reversibility and opening direction
The bevel must face the correct way for the door to close. Many locks have a reversible latch bolt, but the adjustment procedure varies by manufacturer.
Do not force a bolt back: some models can be adjusted without opening the lock case, others require a specific intervention or are not reversible.
When the door no longer stays closed
A worn spring, a misaligned strike plate, or a sagging door may prevent the bolt from engaging. It is necessary to observe the door opening mechanism and the door closing alignment.
Depending on available parts, the repair may involve adjustment, an internal component or the complete lock case. Avoid repeatedly slamming the door to compensate for a fault.
MULTISECU ADVICE
Uncertain about your lock?
A photo of the mechanism, along with some details about your door: we help you identify the right solution.