The MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert. With front and rear wall mount options, as well as jam nut and box mount receptacles, they offer versatility in installation. These connectors, compliant with military specification MIL-DTL-38999 II, are constructed with durable aluminum shells and are available in various plating options, including gold, electroless nickel, and cadmium finishes. Operating in temperatures ranging from -65 °C to 150 °C, they ensure reliable performance in extreme conditions. Utilizing M39029 rear release crimp contacts, they guarantee secure connections, with a mating type of bayonet coupling. Offering environment-resistant protection and a service rating of I, these connectors are ideal for demanding applications in the military and aerospace industries.