Abstract: The mechanical knot for ropes is a device to replace the time-honored metal hook and the conventional knots now used on tow and hoist ropes, and also tethering ropes. The device comprises a length of pipe or tube with an elongated slotted portion or portions in the walls, or a base plate with an elongated slot in it, and with right angle shoulders, each of which has a hole in it. Several methods of manufacture may be used in forming the device from various appropriate materials, including, but not limited to, milling, casting, extruding and bending. Strain on the rope secures the mechanical knot in place. When tension is relaxed, the rope can be easily untied. Should the rope break under strain, it will snap free of the mechanical knot device instantly, thus permitting the device to drop free from the rope. When it is desired to use a rope without the mechanical knot, it simply is slid off the rope.