The 2-5178238-1: It mounts through the board and also secures to a panel via the M2.6 threaded flange — a dual-anchoring scheme that takes the strain off the solder joints in a harness assembly.
Right-Angle Panel Mount with Board Lock
Right-angle through-hole termination with a panel-mount flange (M2.6) means this receptacle is designed for a board-edge position where the cable exits flat against the PCB, and the panel screw provides the primary retention — the solder joints carry signal current, not cable strain. This is a common layout in industrial I/O panels and rack-mount equipment where the connector must survive repeated mate/unmate without fracturing the solder fillets.
The CHAMP.050 II series uses outer shroud contacts.