Abstract: The invention is directed to dead bolt receiver lock that is installed in a boat between the transom and the clamp that mounts an outboard motor to the boat. The dead bolt prevents the unauthorized removal of the outboard motor from the boat. To this end, there is used a dead bolt having at end thereof a rounded head and a another end thereof a threaded end. At the threaded end there mounted a fastening which receives a locking cylinder operated by a key to lock the dead bolt in a locked position to prevent the dead bolt receiver to be removed from the transom clamp combination to prevent any unauthorized removal of the outboard motor from the boat.