The 0.156" (3.96mm) pitch matches the standard MTA-156 header footprint — a common wire-to-board interconnect in appliance, HVAC, and industrial control panels where a reliable, low-cost IDC termination is preferred over crimping. The closed-end housing prevents wire push-through during assembly, and the free-hanging mount means it lands in the cable harness, not on a panel or PCB.
The 0.156" (3.96mm) pitch is the series hallmark — it gives enough room for 20 AWG wire without crowding adjacent contacts, and it mates with the full MTA-156 header family. The closed-end feature is a practical detail: it stops the wire from pushing out the back of the housing when the cable is tugged, which saves a rework step on the line.