An interlocking suspension support hanger for mounting strut members off of a vertical threaded rod includes a pair of support hanger having a rectangular support body with a pivoting pin hole and a fastening pin hole on the support body and a recess opening leading to a center thread configured to fit around the vertical threaded rod. Further, a process for utilizing the support hanger to suspend a strut rack assembly from the vertically threaded rod without passing the assembly over the ends of the rod or removing the existing strut rack is disclosed.