A mortise lock is a type of lockset that requires a pocket, or mortise, to be cut into the door in order for the lock to be installed. The lock consists of a deadbolt and a latch mechanism that operate independently. A cylinder is typically inserted into the lock to operate the deadbolt and/or latch mechanism.
A cylindrical lock, on the other hand, does not require a mortise pocket to be cut into the door. Instead, it is installed using a cylindrical door prep that is drilled into the door. The lock includes a single unit that functions as both the deadbolt and latch mechanism. A cylinder is also inserted into the lock to operate the mechanism.
In summary, the main difference between a mortise lock and a cylindrical lock lies in the type of installation required and the number of separate locking mechanisms included in each.
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