Pivot connecting part intended for a flying vehicle or for system for flying vehicle, in particular a missile, such that it is of a single piece and comprises: - a first elongated body, called internal body , defined with respect to a reference axis (X-X); - a second elongated body, called external body , defined with respect to the reference axis (X-X), radially outwards surrounding said internal body and arranged coaxially to the latter along said reference axis (X-X); - a set of connecting elements forming a continuity of material between the internal body and the external body so as to secure the internal and external bodies to one another in a relative position called fixing position (P1), said connecting elements being capable of being broken under the effect of a predetermined force, with the breaking of said connecting elements disconnecting the internal and external bodies from one another and thus making it possible for a relative rotation between the latter around said reference axis (X-X); - a first cam blocking unit , comprising at least one cam and one stop that engage, of which one forms part of the internal body and the other forms part of the external body , said first blocking unit being capable of blocking the relative rotation between said internal and external bodies with respect to a first direction of rotation (B1) in a relative position referred to as blocking position (P2) between said internal and external bodies ; and - a second ratchet blocking unit , comprising at least one ratchet and one elastic stop blade that engage, of which one forms part of the internal body and the other forms part of the external body , said second blocking unit being capable of blocking the relative rotation between said internal and external bodies in relation to a second direction of rotation (B2) opposed to said first direction of rotation (B1) in said blocking position (P2). - a first elongated body, called internal body , defined with respect to a reference axis (X-X); - a second elongated body, called external body , defined with respect to the reference axis (X-X), radially outwards surrounding said internal body and arranged coaxially to the latter along said reference axis (X-X); - a set of connecting elements forming a continuity of material between the internal body and the external body so as to secure the internal and external bodies to one another in a relative position called fixing position (P1), said connecting elements being capable of being broken under the effect of a predetermined force, with the breaking of said connecting elements disconnecting the internal and external bodies from one another and thus making it possible for a relative rotation between the latter around said reference axis (X-X); - a first cam blocking unit , comprising at least one cam and one stop that engage, of which one forms part of the internal body and the other forms part of the external body , said first blocking unit being capable of blocking the relative rotation between said internal and external bodies with respect to a first direction of rotation (B1) in a relative position referred to as blocking position (P2) between said internal and external bodies ; and - a second ratchet blocking unit , comprising at least one ratchet and one elastic stop blade that engage, of which one forms part of the internal body and the other forms part of the external body , said second blocking unit being capable of blocking the relative rotation between said internal and external bodies in relation to a second direction of rotation (B2) opposed to said first direction of rotation (B1) in said blocking position (P2). <EOS>