The MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an insert. These connectors are environmentally sealed and can operate in temperatures ranging from -65 °C to 200 °C. Offering front wall mount, rear wall mount, and jam nut receptacles, as well as RFI grounding plugs, they provide versatility in installation. With 9 shell sizes and 52 insert arrangements available, they use M39029 rear release crimp contacts in various sizes. Constructed with high-strength aluminum shells, they come in different plating options, including cadmium-free finishes for RoHS compliance. Suitable for military and industrial applications, these connectors ensure reliable connectivity in demanding conditions.