MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various shell sizes and insert arrangements, they include front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs. These connectors use M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8, with options for RoHS certified finishes. Constructed with high-strength aluminum shells and offering plating choices like cadmium and electroless nickel, they ensure reliable performance in demanding applications. Suitable for military and industrial use, these connectors provide secure and durable electrical connections in challenging conditions.