MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with operating temperatures ranging from -65 °C to 200 °C. This connector family includes front and rear wall mount, as well as jam nut receptacles, and RFI grounding plugs. Offering versatility, they come in 9 shell sizes and 52 insert arrangements, utilizing M39029 rear release crimp contacts in various sizes. Constructed with high-strength aluminum shells, they are available in different plating options, including cadmium and nickel finishes. These connectors are designed for military specifications, providing reliable performance in demanding applications.