Wall Mount Receptacle, 56 Contacts (48× #20 + 8× #8) Pin, Shell 25, Olive Drab — MIL-DTL-38999 III

Specifications

Cross-Brand Compatibility

Applications

The D38999/20JJ4HN is a wall mounting receptacle in the MIL-DTL-38999 Series III family, carrying 56 contacts — 48 signal positions at contact size #20 plus 8 power positions at size #8 — on the J-4 insert arrangement (shell size 25). Series III uses a triple-start threaded coupling with a self-locking ratchet that engages before the contacts come into alignment, so the connector is scoop-proof: an attempted mate at an angle cannot bend pins. The J finish is olive drab cadmium over aluminium, the standard military plating for corrosion resistance. Wall mount receptacles fix to a panel through a square flange and are the mating half most often called out on avionics and ground-vehicle harness drawings.

DLA Land and Maritime solicited this exact part number on DIBBS solicitation SPE7M5-26-T-506J (NSN 5935-01-484-3349), quantity 89 EA, quotations due 28 September 2026 — a qualified product for Federal Stock Class 5935.