Aircraft engine attachment pylon having a rear engine attachment provided with a self-locking nut

An attachment pylon for an aircraft engine, the pylon comprising:

• a rigid structure forming a caisson;
• and
• a mounting system of the engine mounted fixed on the rigid structure and comprising a rear engine attachment comprising an attachment body on which is articulated at least one shackle, the rear engine attachment also comprising at least one lateral fitting arranged on either side of the caisson, each lateral fitting comprising a first portion pierced by first assembly holes to enable the lateral fitting to be fixed to the caisson, and comprising a second portion defining a fixing surface in contact with a fixing surface provided on the rear engine attachment body,
• wherein the second portion includes a housing orifice receiving a self-locking nut cooperating with a fixing screw supported against the rear engine attachment body, and in any transversal section passing through the housing orifice, an axis of the fixing screw passes through the first assembly holes.