MIL-DTL-38999 Series II connectors offer reliable performance in harsh environments, featuring up to 128 contacts with environmentally sealed inserts. Operating between -65°C and 200°C, these connectors come in various configurations like front and rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts for secure connections. Made of aluminum, with plating options including cadmium-free finishes, these connectors ensure durability and corrosion resistance. With a bayonet coupling and gold-plated contacts, they guarantee efficient conductivity and 500 mating cycles, suitable for demanding applications requiring environmental resistance.