Fitting for the fixation of a pipe inserted therein, comprising a fitting body, a grip ring with inner teeth designed to penetrate into the pipe during tightening of the grip ring for gripping the pipe, a nut for tightening the grip ring against the pipe, and a joint for sealing between the fitting body and the pipe, wherein the grip ring is tightened by the nut for gripping the pipe inserted therein, and the grip ring is designed to compress the joint against the fitting body when being tightened by the nut, wherein the grip ring extends axially along a main axis between a first ring end and a second ring end, the grip ring having a nut contact part on which the nut is mounted, a joint contact part for pushing the joint against the fitting body, and a force transmission part, wherein the nut contact part extends axially from the first ring end, the joint contact part extends axially from the second ring end, and the force transmission part extending axially between the nut contact part and the joint contact part, said force transmission part being connected to the nut contact part by a first deflection zone and connected to the joint contact part by a second deflection zone, wherein the inner teeth are located on a radially inner gripping surface of the nut contact part, between the first deflection zone and the first ring end, the grip ring being designed to allow a radial movement of the nut contact part towards the pipe and an axial movement of the grip ring for contacting the joint, the first deflection zone has an outer concave deflection surface, the nut contact part has a radial outer sliding surface for receiving the nut, the radial outer sliding surface having a nut sliding surface in contact with the nut, characterized in that the nut contact part has a radial stop for the nut, the radial outer sliding surface has a nut stop surface on a front side of the radial stop, the outer concave deflection surface being located on the rear side of the radial stop, a transition surface is provided between the nut sliding surface and the nut stop surface, the transition surface being curved in a concave manner, the nut sliding surface and the nut stop surface form a single curved surface. wherein the grip ring is tightened by the nut for gripping the pipe inserted therein, and the grip ring is designed to compress the joint against the fitting body when being tightened by the nut, wherein the grip ring extends axially along a main axis between a first ring end and a second ring end, the grip ring having a nut contact part on which the nut is mounted, a joint contact part for pushing the joint against the fitting body, and a force transmission part, wherein the nut contact part extends axially from the first ring end, the joint contact part extends axially from the second ring end, and the force transmission part extending axially between the nut contact part and the joint contact part, said force transmission part being connected to the nut contact part by a first deflection zone and connected to the joint contact part by a second deflection zone, wherein the inner teeth are located on a radially inner gripping surface of the nut contact part, between the first deflection zone and the first ring end, the grip ring being designed to allow a radial movement of the nut contact part towards the pipe and an axial movement of the grip ring for contacting the joint, the first deflection zone has an outer concave deflection surface, the nut contact part has a radial outer sliding surface for receiving the nut, the radial outer sliding surface having a nut sliding surface in contact with the nut, characterized in that the nut contact part has a radial stop for the nut, the radial outer sliding surface has a nut stop surface on a front side of the radial stop, the outer concave deflection surface being located on the rear side of the radial stop, a transition surface is provided between the nut sliding surface and the nut stop surface, the transition surface being curved in a concave manner, the nut sliding surface and the nut stop surface form a single curved surface.