An assembly for transmitting torque to an aircraft actuator comprising: a torque tube having a longitudinal axis; an end fitting comprising: a connector portion; and an engagement portion inserted into the torque tube, wherein the engagement portion includes: a first end adjacent the connector portion; a second end opposite the first end; and a coupling region between the first and second end that includes an outer coupling surface having an outer diameter and having a continuous groove formed thereon; wherein the continuous groove includes two axial grooves that extend along outer coupling surface along the longitudinal axis and a first parallel groove that extends circumferentially about the longitudinal axis along the outer coupling surface and that joins the two axial grooves; and characterized in that: the continuous groove further includes a third axial groove and a second parallel groove, the second parallel groove connecting one of the two axial grooves to the third axial groove, wherein the first parallel groove is at the first end and the second parallel groove is at the second end; and in that the torque tube is electromagnetically formed to the outer coupling surface of the engagement portion. a torque tube having a longitudinal axis; an end fitting comprising: a connector portion; and an engagement portion inserted into the torque tube, wherein the engagement portion includes: a first end adjacent the connector portion; a second end opposite the first end; and a coupling region between the first and second end that includes an outer coupling surface having an outer diameter and having a continuous groove formed thereon; wherein the continuous groove includes two axial grooves that extend along outer coupling surface along the longitudinal axis and a first parallel groove that extends circumferentially about the longitudinal axis along the outer coupling surface and that joins the two axial grooves; and characterized in that: the continuous groove further includes a third axial groove and a second parallel groove, the second parallel groove connecting one of the two axial grooves to the third axial groove, wherein the first parallel groove is at the first end and the second parallel groove is at the second end; a connector portion; and an engagement portion inserted into the torque tube, wherein the engagement portion includes: a first end adjacent the connector portion; a second end opposite the first end; and a coupling region between the first and second end that includes an outer coupling surface having an outer diameter and having a continuous groove formed thereon; wherein the continuous groove includes two axial grooves that extend along outer coupling surface along the longitudinal axis and a first parallel groove that extends circumferentially about the longitudinal axis along the outer coupling surface and that joins the two axial grooves; and characterized in that: the continuous groove further includes a third axial groove and a second parallel groove, the second parallel groove connecting one of the two axial grooves to the third axial groove, wherein the first parallel groove is at the first end and the second parallel groove is at the second end; a first end adjacent the connector portion; a second end opposite the first end; and a coupling region between the first and second end that includes an outer coupling surface having an outer diameter and having a continuous groove formed thereon; wherein the continuous groove includes two axial grooves that extend along outer coupling surface along the longitudinal axis and a first parallel groove that extends circumferentially about the longitudinal axis along the outer coupling surface and that joins the two axial grooves; and characterized in that: the continuous groove further includes a third axial groove and a second parallel groove, the second parallel groove connecting one of the two axial grooves to the third axial groove, wherein the first parallel groove is at the first end and the second parallel groove is at the second end;