A locking mechanism is provided for a lock body and a rotatable key plug. The locking mechanism comprises pins having recesses, each of the pins adapted to be disposed in pin bores in the key plug for reciprocal and rotational movement. An elongated spring member simultaneously engages and biases the pins toward a keyway in the key plug. A locking bar moves between a first position and a second position where at least a portion of the locking bar is received in the recesses in the pins. The locking bar is prevented from moving to the second position unless the pins are in a position where the recesses are aligned with the locking bar. Upon insertion of a key in the keyway the pins are moved axially or rotated for aligning the recesses in the pins with the locking bar so the key can rotate the key plug.

The present disclosure discloses a padlock, comprising a lock cylinder and a lock housing. The lock cylinder is rotatable between a lock position and an unlock position with rotation of a key. The a lock housing comprises a sleeve shaped to fit with and for receiving the lock cylinder, a first prong extending outward from the sleeve and having a first recessed portion and a second prong extending outward from the sleeve and having a second recessed portion; wherein when the lock cylinder is rotated into the lock position/the unlock position, the through holes are aligned with the first recessed portion/the second recessed portion, the first pins/second pins are movable in the through holes and the first recessed portion/the second recessed portion, allowing the removal of the key from the keyhole.