6-Position IDC Receptacle for 0.156" Pitch Harnesses
It accepts either discrete wires or ribbon cable, making it a flexible choice for harness builds where you want to skip individual crimping. The closed-end back wall stops the wire at a positive depth — no risk of pushing the conductor through the back during assembly. The 0.156" (3.96mm) pitch matches the standard MTA-156 header footprint. At 6 circuits, this is a mid-range position count in the series — common for power or signal distribution in appliances, HVAC controls, and lighting ballasts where the wire gauge and pitch align with the current draw.
IDC Termination and Wire Prep
The 3-640427-6 is specced for 20 AWG wire; using a different gauge risks an unreliable gas-tight joint. The closed-end feature is a practical detail: it gives a positive stop for the wire, so the assembler knows the conductor is fully seated without a visual check through the back. This thickness ensures the slot bites through the oxide layer on the wire and maintains a stable connection over temperature cycles. It is not a high-mating-cycle finish; the IDC joint is essentially a one-time termination.
Locking Ramp and Harness Retention
It is a single-action latch: push to mate, lift the ramp to release.