Cable bolt assemblies including tension cylinders and tension nuts, alone or in combination with cables and roof bearing plates, for use in underground mines to support mine roofs, are disclosed herein, as well as methods of securing roof cables to and within a mine roof for superior and immediate support. The cables have a first end securable within a borehole in a roof, a second end for exposure from the borehole, and a weight bearing nut secured to the second end. The tension cylinder accommodates, yet is not affixed to, the cable, and includes a threaded exterior surface and an interior cable-accommodating channel. The tension nut has a threaded interior surface complementary to the threaded exterior surface of the tension cylinder, and is rotatable about the tension cylinder. The assembly with the cable and roof bearing plate are positioned within the borehole so that the tension cylinder is within and extends beyond the aperture of the roof bearing plate, and rests against the weight bearing nut of the cable. As the tension nut is rotated about the tension cylinder, and until the nut has compressed the roof bearing plate against the mine roof, the cable does not rotate or twist.