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