Assembly comprising a translationally and rotationally immobile link axis, engine attachment or aircraft comprising such an assembly

An assembly comprising:

• a link axis comprising a cylindrical sidewall,
• a clevis having a first branch and a second branch, the cylindrical sidewall of the link axis passing through aligned holes in the first branch and the second branch,
• a first guiding ring supporting the link axis positioned in the first branch of the clevis, the first guiding ring having a flange on one end positioned against an inner face of the first branch of the clevis facing an inner face of the second branch and a tubular body terminating at an opposite end of the guiding ring, the tubular body having a diameter greater than a diameter of the cylindrical sidewall of the link axis,
• a second guiding ring supporting the link axis, positioned in the second branch of the clevis, comprising a tubular body and a tubular extension protruding with respect to an outer face of the second branch,
• wherein the tubular extension of the second guiding ring comprises an outer circumferential face having a threaded portion,
• wherein the assembly comprises a nut configured to be screwed onto the threaded portion of the tubular extension of the second guiding ring and an immobilization system configured to immobilize the nut in at least one of translation or in rotation, and
• wherein the nut and the link axis have a common axis of rotation and are linked by a complete link comprising a fixed coupling between the nut and a distal end of the link axis that is not removable or that forms a single-piece part, wherein the complete link is formed radially inwardly of a threaded connection between the nut and the tubular extension of the second guiding ring and forms a portion of a groove located between an inner wall of the nut and an outer surface of the link axis, wherein the tubular extension of the second guiding ring is housed within the groove, and wherein rotational movement by the nut is transferred to the link axis.