The MIL-DTL-38999 Series I connectors feature up to 128 contacts in a durable insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in front and rear wall mount as well as jam nut receptacles, they ensure RFI grounding. With 9 shell sizes and 52 insert arrangements, these connectors use M39029 crimp contacts in various sizes, including coax and twinax. Constructed with high-strength aluminum shells, they offer plating options like iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum. RoHS certified finishes are also available, making them versatile for different applications.