MIL-DTL-38999 Series I connectors offer high-performance connectivity, with up to 128 contacts housed in a durable insert. Engineered for harsh environments, these connectors are environmentally sealed and capable of operating in temperatures ranging from -65 °C to 200 °C. The versatile family includes front wall mount, rear wall mount, and jam nut receptacles, as well as RFI grounding plugs, providing flexibility for various installation needs. With 9 shell sizes and 52 insert arrangements available, they accommodate M39029 rear release crimp contacts in different sizes, ensuring compatibility with a wide range of applications. Constructed with high strength aluminum shells, these connectors are offered in various plating options, including cadmium-free finishes for RoHS compliance. The connectors, with a shell size of 11 and contact size of 20(7), feature gold-plated removable crimp contacts and bayonet coupling for secure mating. Designed for back panel wall mounting, these connectors are ideal for demanding environments, offering reliability with a service rating of I and a mating life of 500 cycles. Their conductivity and ingress protection make them suitable for use in environment-resistant applications.