The MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an insert with environmental sealing. Operating in temperatures ranging from -65°C to 200°C, these connectors come in various shell sizes and insert arrangements, including front and rear wall mount, jam nut receptacles, and RFI grounding plugs. Utilizing M39029 rear release crimp contacts, they offer reliable connectivity in sizes 22D, 22M, 22, 20, 16, and 8. Constructed with high-strength aluminum shells and available in different plating options such as cadmium and nickel, these connectors ensure durability and performance. RoHS certified finishes are also available, making them suitable for diverse applications requiring rugged and reliable electrical connections.