MIL-DTL-38999 Series I connectors offer high-performance connectivity with up to 128 contacts in an environmentally sealed insert. Designed for harsh environments, these connectors feature front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. With options for RoHS certified finishes, including cadmium-free plating, they provide reliable operation in temperatures ranging from -65 °C to 200 °C. The connectors, compliant with military specification MIL-DTL-38999 I, come in nine shell sizes and 52 insert arrangements, utilizing rear release crimp contacts for secure connections. Constructed with high strength aluminum shells and offering a variety of plating options such as electroless nickel and black anodized aluminum, they ensure durability and longevity. Suitable for box mounting applications, these connectors are ideal for demanding environments where rugged performance is essential.