MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, designed for extreme operating temperatures ranging from -65 °C to 200 °C. This harsh environment connector family includes front and rear wall mount, as well as jam nut receptacles with RFI grounding plugs, offering versatility in installation. With 9 shell sizes and 52 insert arrangements available, these connectors utilize M39029 rear release crimp contacts in various sizes, including coax and twinax. Constructed with high strength aluminum shells, they come with plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum. RoHS certified cadmium-free finishes are also offered, ensuring compliance with environmental regulations. Suitable for military and industrial applications, MIL-DTL-38999 Series I connectors provide reliable connectivity in demanding environments.