MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert. These connectors are environmentally sealed and can operate in temperatures ranging from -65°C to 200°C. Available in various configurations like front wall mount, rear wall mount, and jam nut receptacles, they offer versatility for different applications. The plugs come in straight, RFI grounding, and standard options with a 90-degree cable clamp. With 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts, ensuring secure connections. Constructed with aluminum shells and offering multiple plating options, including cadmium-free finishes, these connectors meet stringent military specifications for reliability and performance in demanding environments.