MIL-DTL-38999 Series I 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 such as front wall mount, rear wall mount, and jam nut receptacles, they offer versatility for different applications. With 9 shell sizes and 52 insert arrangements, they accommodate M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8. Constructed with high-strength aluminum shells, they come in plating options including light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS-certified cadmium-free finishes available. The connectors, meeting MIL-DTL-38999 I military specifications, assure reliable performance with their durable design and conductivity. Suitable for box mounting and back panel installations, these connectors with gold-plated contacts offer a secure and efficient electrical connection for demanding environments.