Board Layout and Orientation
The 0026482042: The 0.573" (14.55mm) mating pin length gives good entry depth into the receptacle before the contact beams engage.
Mating Interface and Contact Finish
The mating contacts are gold-plated to 20 µinch (0.51µm) over brass — this is a field-service-grade finish that handles repeated connect/disconnect cycles without the fretting corrosion you'd see with tin on tin. The post tails are tin-plated at 100 µinch (2.54µm) for reliable solder wetting through the hole. This header mates with any KK396 crimp housing or IDC receptacle that accepts a 3.96mm-pitch, 4-circuit, single-row interface.