The 2-179958-4: It accepts crimp socket contacts (ordered separately) and terminates in-line — free-hanging, no panel or board mount. The black thermoplastic polyester housing, glass-filled, carries a polarizing key to prevent cross-mating in multi-connector harnesses.
The Sourcing Reality: Contacts Not Included
The 10.16 mm pitch is the widest in the D-5200 family, so the terminal cavity is physically larger than the 5.08 mm-pitch D-3200 sibling; don't assume a common terminal across the series. The polarizing key is integral to the housing — it's not a loose insert — and it keys the housing to a specific header keyway, so confirm the mating half's key position before committing.