A flexible coupling configured to couple a first shaft and a second shaft, said flexible coupling comprises : - a first external coupling body substantially cylindrical in revolution about an axis (X), said first body having a first end configured to be attached to the first shaft, a second end configured to be attached to the second shaft, and a connecting section that connects the first and second ends , the first body having a radially inner face and comprising at least a first tooth , attached to the radially inner face , - a second inner coupling body substantially cylindrical in revolution which is arranged inside the first body and is attached to the connecting section , the second body having a radially outer face and comprising at least one second tooth attached to said radially outer face , the first body having a driving portion and a driven portion , the driving portion and the driven portion being connected to each other via the second body , the connecting section further comprises a first bellows connecting the driving part of the first body to the second body and a second bellows connecting the second body to the driven part of the first body , the flexible coupling is symmetrical about a radial plane, said radial plane being normal to the axis (X), the first and second bellows are formed by at least one annular corrugation protruding from a radially outer face of the first body , the first and second bellows each having a first wall , extending radially with respect to the driving portion of the first body a second wall fixed to the second body and a top connecting the first wall and the second wall , a radial height of the first wall being less than a radial height of the second wall and the flexible coupling being characterised in that : the first tooth and the second tooth are configured to come into contact when a torque is applied to the first end of the first body in order to transmit said torque to the second end of the first body via the second body . - a first external coupling body substantially cylindrical in revolution about an axis (X), said first body having a first end configured to be attached to the first shaft, a second end configured to be attached to the second shaft, and a connecting section that connects the first and second ends , the first body having a radially inner face and comprising at least a first tooth , attached to the radially inner face , - a second inner coupling body substantially cylindrical in revolution which is arranged inside the first body and is attached to the connecting section , the second body having a radially outer face and comprising at least one second tooth attached to said radially outer face , the first body having a driving portion and a driven portion , the driving portion and the driven portion being connected to each other via the second body , the connecting section further comprises a first bellows connecting the driving part of the first body to the second body and a second bellows connecting the second body to the driven part of the first body , the flexible coupling is symmetrical about a radial plane, said radial plane being normal to the axis (X), the first and second bellows are formed by at least one annular corrugation protruding from a radially outer face of the first body , the first and second bellows each having a first wall , extending radially with respect to the driving portion of the first body a second wall fixed to the second body and a top connecting the first wall and the second wall , a radial height of the first wall being less than a radial height of the second wall and the flexible coupling being characterised in that : the first tooth and the second tooth are configured to come into contact when a torque is applied to the first end of the first body in order to transmit said torque to the second end of the first body via the second body . <EOS>