The deadlocking is controlled by a snib in the forend. When the snib is in its up position, the door will deadlock when closing and can only be opened with a key or the thumbturn. When the snib is in its down position, the door can also be opened with the handles.
The lock case works with the 4690, 4691, LP711, LP714, LP721, and LP731 striker plates.
Fire resistance: -
Mortice standard: SFS 5208, SS 81 73 83.
LC204 can be used to as a replacement lock of old 4180.
