Abstract: An orthodontic appliance has a rod unit pivotally connected with arch wires by hinge members. The rod unit has bearing apertures at both ends. Each hinge member has a cylindrical shaft and a head on one end that is wider than the shaft and integrally former with the shaft. The shaft has an opening extending across its longitudinal axis. The shaft and the head are free of both outer and inner threads. The rod unit is pivotally connected with the arch wire by inserting the shaft of the hinge member into the bearing aperture and inserting the arch wire into the opening in the shaft.