MIL-DTL-38999 Series I connectors are designed for harsh environments with up to 128 contacts in a sealed insert. Operating between -65 °C and 200 °C, they offer front and rear wall mount options, jam nut receptacles, and RFI grounding plugs. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts in various sizes. Constructed with high-strength aluminum shells and offering plating options like cadmium and nickel, these connectors ensure durability and reliability. Suitable for military and industrial applications, they meet stringent environmental standards.