MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, designed for harsh environments with operating temperatures ranging from -65 °C to 200 °C. Available in various shell sizes and insert arrangements, they offer front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. These connectors utilize M39029 rear release crimp contacts, with options for RoHS certified finishes. Constructed with high-strength aluminum shells, they come in plating choices like light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum. Suitable for military and industrial applications, they ensure reliable performance with their environment-resistant design and durable construction.