Pull or push rod or locking nut for a molding machine

A pull or push rod for a molding machine having at least one groove, wherein the at least one groove is suitable for forming a positive-locking connection with a locking nut, by means of which positive-locking connection, forces are transmittable between the locking nut and the pull or push rod, wherein the at least one groove:

• has a groove cross-section,
• has at least two groove side walls, and
• has a groove base,
• wherein the at least two groove side walls, viewed in the groove cross-section, each transition with at least one transition curvature into the groove base, wherein the groove base in the groove cross-section is at least partially formed as a curvature, wherein the curvature of the groove base differs from the transition curvatures of the groove side walls.