A clamping collar includes a belt that co-operates with a tightening member(s) and that is made up of two belt portions interconnected at their connection ends. Each of these connection ends has a joggle between an end segment and a coupling segment. The joggle is provided with a slot that extends transversely to a step. The connection ends are thus interlocked, the step of each connection end being disposed in the slot of the other end and the coupling segment of each of the ends being disposed against the end segment of the other end, so that the retaining surfaces belonging to respective ones of the two ends co-operate with each other.