Abstract: A locking hardware adapted to conceal and confine the clamp screws of an outboard motor against operative removal from the transom board of a boat and the like by the provision of a back plate set against the transom board by the clamp screws and having a stud bolt parallel to the clamp screws and inboard arm of the C clamp of the motor upon which stud bolt a channel iron cover member is mounted to confine the handles of the clamp screws, the cover member having a cylindrical shell aligned with the threaded end of the stud bolt for receiving a wrench operated nut therein for securing the cover member to the bolt and lock receiving keyway in the wrench head of the nut for locking such nut within the cylindrical shell to prevent removal of the nut therefrom.