Abstract: A device for preventing access to a nut or bolt fastening a valuable item such as an outboard motor on a boat, a riding lawnmower to a burglar cable, or the like. The device is independent of the nut and bolt, and includes a body that receives the bolt head or nut in a chamber, with the shaft protruding to the exterior where it is threadedly fastened to the valuable item. At a second aperture the chamber receives a flanged plug that prevents access to the head of the bolt. A locking pin threadedly engaged through a third aperture in the body engages an annular indented region on the plug to prevent its removal. A unique head on the locking pin is matched with the same style key to thread and unthread the locking pin from the body. An optional slotted chamber design permits securing of a cable to the nut and bolt combination by including a slot in the body that is occluded by the plug when it is inserted into the chamber and locked by the locking pin.

Abstract: A locking assembly for preventing access to a nut threadedly secured onto a bolt, the nut and bolt generally mounting an article, such as an outboard motor, to a structure, such as a boat transom. The locking assembly is independent of the bolt and nut, and includes a cylindrical housing that receives the bolt through one end thereof and allows for the threading of the nut onto the bolt. A cap that is received on the end of the housing opposite the bolt, by a boss and counterbore arrangement, is rotatably retained by a roll pin. The cap includes a tapered bore that receives a threaded stud and locking lug assembly. The threaded stud is received by a locking lever that is nonrotatably retained within the housing. As the locking lug is tightened, the cap is secured to the housing to prevent access to the nut.