17-Position IDC Receptacle for MTA-100 Harnesses
The 4-640440-7: The IDC termination presses 22 AWG wire into the slot without stripping or crimping — the insulation is displaced by the contact tines, making a gas-tight joint. The red housing is a closed-end design — the last cavity is blocked, so a wire cannot be inserted past the end of the row. This matters when the harness is built on a bench and the assembler works by feel: the closed end stops a stray wire from bottoming out and leaving a partial insertion.
Contact Finish and Termination
The female socket contacts carry an 80.0 µ" (2.03 µm) tin finish. That is a heavy tin layer — thick enough to survive the IDC insertion without cracking the plating at the wire slot. The IDC slot accepts 22 AWG wire, either discrete or ribbon cable. The termination is permanent — once the wire is pressed in, it is not meant to be pulled out and re-terminated. For a harness that needs field-replaceable wires, a crimp-style MTA-100 contact would be the alternative.