Assembly for an aircraft engine mounting comprising: - an articulation axis, - a first plain bearing supporting the articulation axis, positioned in a first branch of a yoke joint and comprising an internal shoulder (76.3) blocking the translation of the articulation axis in a first direction in operation, - a second plain bearing supporting the articulation axis, positioned in a second branch of the yoke joint, comprising a tubular body (78.2) and a tubular extension, said tubular extension having a first, tapped internal portion, - a blocking device blocking the translation of the articulation axis in a second direction in operation which comprises: ∘ a blocking screw, extending between a first end face (90.1) against which the articulation axis bears in operation and a second end face (90.2), having a first section which adjoins the first end face (90.1) and a second section which adjoins the second end face (90.2), the first section comprising a threading that is screwed in operation onto the first, tapped internal portion of the tubular extension, ∘ first and second blocking systems (106, 108) for immobilizing the blocking screw relative to the tubular extension, the assembly being characterized in that the first blocking system comprises an internal elastic stop ring and a groove, formed in the tubular extension, in operation partially housing the internal elastic stop ring and in that the second blocking system comprises a blocking wire, first orifices passing through the second section of the blocking screw and second orifices passing through the tubular extension, the blocking wire in operation passing through the first and second orifices (116, 118) to ensure a blocking of the blocking screw relative to the tubular extension. - an articulation axis, - a first plain bearing supporting the articulation axis, positioned in a first branch of a yoke joint and comprising an internal shoulder (76.3) blocking the translation of the articulation axis in a first direction in operation, - a second plain bearing supporting the articulation axis, positioned in a second branch of the yoke joint, comprising a tubular body (78.2) and a tubular extension, said tubular extension having a first, tapped internal portion, - a blocking device blocking the translation of the articulation axis in a second direction in operation which comprises: ∘ a blocking screw, extending between a first end face (90.1) against which the articulation axis bears in operation and a second end face (90.2), having a first section which adjoins the first end face (90.1) and a second section which adjoins the second end face (90.2), the first section comprising a threading that is screwed in operation onto the first, tapped internal portion of the tubular extension, ∘ first and second blocking systems (106, 108) for immobilizing the blocking screw relative to the tubular extension, the assembly being characterized in that the first blocking system comprises an internal elastic stop ring and a groove, formed in the tubular extension, in operation partially housing the internal elastic stop ring and in that the second blocking system comprises a blocking wire, first orifices passing through the second section of the blocking screw and second orifices passing through the tubular extension, the blocking wire in operation passing through the first and second orifices (116, 118) to ensure a blocking of the blocking screw relative to the tubular extension. ∘ a blocking screw, extending between a first end face (90.1) against which the articulation axis bears in operation and a second end face (90.2), having a first section which adjoins the first end face (90.1) and a second section which adjoins the second end face (90.2), the first section comprising a threading that is screwed in operation onto the first, tapped internal portion of the tubular extension, ∘ first and second blocking systems (106, 108) for immobilizing the blocking screw relative to the tubular extension, the assembly being characterized in that the first blocking system comprises an internal elastic stop ring and a groove, formed in the tubular extension, in operation partially housing the internal elastic stop ring and in that the second blocking system comprises a blocking wire, first orifices passing through the second section of the blocking screw and second orifices passing through the tubular extension, the blocking wire in operation passing through the first and second orifices (116, 118) to ensure a blocking of the blocking screw relative to the tubular extension.