Plugging system for a bearing race (2, 3) comprising a main annular body about a bearing axis, the main body having an inner peripheral surface and an outer surface opposite the inner peripheral surface, one of the inner and outer peripheral surfaces (6, 12) comprising a bearing surface ( 8, 9) for rolling bodies of the bearing, the main annular body further comprising a circular through hole having an axis, called filling axis, said through hole opening out, on the one hand, on the bearing surface ( 8, 9) and, on the other hand, on an axial support surface, the plugging system comprising: - a plug that can be tightly fitted to extend into the circular through hole of the main body, the plug comprising a bottom end, a top end, a circular lateral surface about an axis of the plug and a non-cylindrical surface intended to cooperate with a radial stop face of the body; - means for installing the plug in a predetermined position relative to the main body, in which position an orientation of the plug about the filling axis and a plug depth along the filling axis are determined so that the bottom end of the plug and the bearing surface (8, 9) of the main body are flush with each other, together forming a bearing track for the rolling bodies, the installation means comprising a radial stop means along a positioning axis of the main body and a stop means along the filling axis cooperating with the axial support surface, the positioning axis being non-parallel to the filling axis; - a system for locking the predetermined orientation and depth of the plug in the through hole of the main body, the locking system comprising a retention element having a contact end, the locking system further comprising a retention surface arranged on the lateral surface of the plug, the normal line on the retention surface being inclined relative to the axis of the plug by a retention angle (α) other than 90° in a plane parallel to the axis of the plug, and being oriented towards the top end of the plug, the axis of the plug also being offset relative to the normal line of the considered retention surface at the contact barycentre between the retention element and the retention surface; the locking system being able to assume an active state for locking the plug on the main body, in which state, with the retention element extending into a perforation of the main body that opens out on the circular through hole, the contact end of the retention element is in abutment against the retention surface of the plug through at least one contact point, the retention element exerting a torque that tends to pivot the plug about the axis until the non-cylindrical surface comes into abutment against the radial stop face of the body, and an inactive state, in which the plug can be disassembled from the main body, thus opening the circular through hole to allow rolling bodies of the bearing to pass through the circular through hole. - a plug that can be tightly fitted to extend into the circular through hole of the main body, the plug comprising a bottom end, a top end, a circular lateral surface about an axis of the plug and a non-cylindrical surface intended to cooperate with a radial stop face of the body; - means for installing the plug in a predetermined position relative to the main body, in which position an orientation of the plug about the filling axis and a plug depth along the filling axis are determined so that the bottom end of the plug and the bearing surface (8, 9) of the main body are flush with each other, together forming a bearing track for the rolling bodies, the installation means comprising a radial stop means along a positioning axis of the main body and a stop means along the filling axis cooperating with the axial support surface, the positioning axis being non-parallel to the filling axis; - a system for locking the predetermined orientation and depth of the plug in the through hole of the main body, the locking system comprising a retention element having a contact end, the locking system further comprising a retention surface arranged on the lateral surface of the plug, the normal line on the retention surface being inclined relative to the axis of the plug by a retention angle (α) other than 90° in a plane parallel to the axis of the plug, and being oriented towards the top end of the plug, the axis of the plug also being offset relative to the normal line of the considered retention surface at the contact barycentre between the retention element and the retention surface;