Abstract: A radial flange coupling for joining a turbo-charger unit end housing to a turbo-charger center (or bearing) housing and for joining a turbine housing to an exhaust outlet connection including first and second arcuate jaws containing first and second radially inwardly opening grooves for clamping together flanged elements as the jaws are moved from an open to closed position wherein the jaws are hingedly joined by a connection that includes an extension integrally formed at the end of one jaw and extends through an opening in the other jaw and back to the first jaw where the distal end of the extension is affixed to the one jaw. The other ends of the jaws include end projections. One projection includes a threaded nut permanently affixed thereto. A threaded bolt having a reduced diameter pilot is provided for self piloting during assembly.