Abstract: The invention relates to a padlock consisting of a lock casing body and a lock shackle, the ends of said shackle being received in recesses in the lock casing body. A first shackle end comprises a return gap for blocking the movement of the shackle in the locked state, and a second shackle end comprises a groove for defining the movement of the shackle in the opened state. Furthermore, an inwardly extending recess oriented parallel to the shackle ends and used to receive an entire standard locking cylinder, especially a standard half locking cylinder, is provided in the bottom region of the lock casing body, opposing the lock shackle. According to the invention, a displaceable and/or pivotable actuating element is provided in the displacement path of the lock bit of the standard locking cylinder.