18 circuits, 3 rows, 5 mm pitch — the Metrimate workhorse
The 207444-9: The latch lock and 4-wall shrouding with a mounting flange mean it's built for environments where vibration would rattle a simpler header loose — think industrial control cabinets or under-hood automotive junction boxes.
The 600 V rating is the working voltage between adjacent circuits — the 5.00 mm pitch and UL94 V-0 nylon housing support that separation.
Mating and mounting — what goes with it
This is a through-hole header with a 0.181" (4.60 mm) solder tail. The mounting flange takes a screw for extra board retention, which helps when the harness is routed under tension.