Abstract: A cable lock coupling is part of a surfboard locking system. The coupling includes a housing, a pin, a ring and jaws. The pin is slidably fitted in the housing and is movable between a first position and a second position. The ring is coupled to a first end of the pin, is sized/shaped to slidably fit only in a first portion of the housing, and is able to receive a cable lock's cable therethrough when it substantially protrudes from the housing when the pin is in the first position. The jaws, coupled to a second end of the pin, are free to open when the pin is in the second position, and are forced to close when the pin is in the first position. The cable portion of a cable lock is passed through the ring protruding from the housing when the pin is in the first position.