The 0.156" (3.96mm) pitch gives enough room to land 20 AWG wire without crowding adjacent circuits — a practical spacing for control-panel and appliance harnesses where the wire gauge is fixed by current draw, not routing density.
Plating and Termination — What the 80.0µin Tin Means for the Build
It handles repeated IDC termination without galling and gives decent corrosion resistance in indoor equipment environments. For a plug that terminates once and stays mated, tin is the cost-effective choice; the thick layer also means the IDC slots bite cleanly into the 20 AWG conductor without cold-flow creep over time.