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 (2, 3) to one another in a relative position called fixing position, 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 (2, 3) 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 (2, 3) with respect to a first direction of rotation in a relative position referred to as blocking position between said internal and external bodies (2, 3); 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 (2, 3) in relation to a second direction of rotation opposed to said first direction of rotation in said blocking position. - 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 (2, 3) to one another in a relative position called fixing position, 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 (2, 3) 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 (2, 3) with respect to a first direction of rotation in a relative position referred to as blocking position between said internal and external bodies (2, 3); 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 (2, 3) in relation to a second direction of rotation opposed to said first direction of rotation in said blocking position.