Abstract: A continuously reinforced composite mandrel is molded by creating an excess of material through a tapered cone and pressing a male thread profile on the exterior of the mandrel at the excess. To form the female thread, an integral component can be used as a separate component in the mandrel to mold the shape of the threads. The integral component is a sufficiently thin shell to transfer mechanical loads to the composite mandrel (i.e. the integral component does not carry significant mechanical loads). Alternatively, to form female threads, a coil is wrapped with the composite material when the mandrel is formed, and the coil is compressed or twisted to an expanded width to form the female threads inside the mandrel. When the coil is relieved, it can be removed from the formed threads.