6-Position Mini-Fit Jr Plug, 4.20mm Pitch
The Molex 0039013063 is a 6-circuit plug from the Mini-Fit Jr 5559 series, built for wire-to-wire and wire-to-board power interconnects in harness assemblies. It carries two rows on a 0.165" (4.20mm) pitch, giving it the same footprint as the full Mini-Fit Jr family — so the board layout and mating receptacle stay consistent across 2- through 24-circuit variants.
The listing note spells it out: contacts not included. This plug ships as an empty housing only. You need the 45750-series male crimp terminals (Molex 45750-3111 for 18-24 AWG, or the 45750-2111 for 20-24 AWG) to populate it. For a harness build, figure one terminal per circuit plus a few spares for pull-test rejects.
Mates With 5557 Receptacle — Locking Ramp Holds Under Vibration
This plug mates with the Mini-Fit Jr 5557-series receptacle housing (dual-row, same 4.20mm pitch). That ramp is the difference between a connector that stays mated on a forklift and one that backs off a half-turn and drops a sensor. No secondary lock or TPA required for most applications, though the 5557 receptacle does accept a CPA (Connector Position Assurance) insert if the customer spec demands it.