MIL-DTL-38999 Series I connectors are designed for harsh environments with up to 128 contacts in an insert. These connectors, featuring front wall mount, rear wall mount, and jam nut receptacles, are environmentally sealed and capable of operating in temperatures ranging from -65 °C to 200 °C. Compliant with military specification MIL-DTL-38999 I, they offer reliability and durability with high strength aluminum shells and a variety of plating options including cadmium-free finishes. Utilizing M39029 rear release crimp contacts, they provide secure connections with mating cycles up to 500. Suitable for various applications, these circular plugs ensure conductivity and ingress protection, making them ideal for demanding environments.