Abstract: An automatic hook lock which is electrically and manually operable and is particularly adapted for manual, motorized or remotely controlled sliding gates to which it is attached on the surface thereof or within the interior thereof. The lock consists of a rectangular metal box containing an electromagnetic solenoid with relative magnetic plate, a cylinder lock with a key, a hook and a system of five rocker levers actuated by a spring-compressed plunger. The lock is assembled in such a way that every time the solenoid receives an electrical impulse, the magnetic plate is moved to release the system of rocker levers. The combined action automatically provides the freeing and elevation of the hook. The inverse, blocking action occurs automatically with the closing of the gate. The mechanical, manual opening of the lock is achieved using a key.