A string assembly system that includes a first conduit defining a first end and a second end. A second conduit defining a third end and a fourth end. A first connector assembly coupled to the second end of the first conduit. The first connector assembly includes a first connector shaft that rotates relative to the first conduit and the second conduit. A first alignment shaft that axially aligns the first conduit and the second conduit. A second connector assembly couples to the third end of the second conduit. The second connector assembly couples to the first connector shaft, and the first conduit rotates relative to the second conduit.