Deadbolt – the deadbolt locks or unlocks the door when the locking cylinder is operated, e.g. by key or fingerprint.
Latch – the lock latch (also called catch) holds the closed door in its position when unlocked. When there is a lever handle, the door can be opened by the handle, without the need of a key. Usually, the latch is bevelled on one side. When the door is closed, the latch is pushed into the lock along its bevelled surface and fits into the recess in the frame. The door is closed.
Mullion – the mullion is the metal element embedded in the door, which remains visible after installation. A mullion usually has two cutouts for fastening.
Lock nut with square hole – the nut is a rotatable element with a square hole for the lever handle. When the handle is operated, the nut transfers the movement to the lock latch. The latch retracts and the door opens.
Lock cylinder – the lock cylinder consists of a housing and a rotatable cylinder core. The cylinder core can only be turned if a matching key is used. Lock cylinders are distinguished in different security levels. The higher the security level, the higher the burglary protection.
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