a padlock device including a unitary , elongated , cylindrical metal body having spring loaded shackle elements extending into one end thereof and a key - locking cylinder assembly extending into the other end . rounded recesses are formed along the sides of the cylindrical body and the shackle pin holes are arranged so that the pins respectively extend through the recesses . the locking cylinder includes a pawl mechanism which engages notches in the ends of the shackle pins for locking the pins in the closed position .