MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert with environmental sealing. Operating between -65°C and 200°C, they offer reliable performance in extreme conditions. Available in various configurations like front/rear wall mount, jam nut, and box mount receptacles, they suit diverse applications. With options for straight, RFI grounding, and standard plugs, they ensure secure connections. Compliant with military specification MIL-DTL-38999 II, these connectors come in aluminum shells with plating choices including cadmium-free finishes. The 52 insert arrangements with M39029 rear release crimp contacts provide versatility, while the EMI/RFI shielding and 500-cycle mating life guarantee durability. Suitable for environment-resistant box and bulkhead mounting receptacles, these connectors are essential for demanding military and industrial setups.