MIL-DTL-38999 Series I connectors, featuring up to 128 contacts in an insert, are designed for harsh environments with operating temperatures ranging from -65 °C to 200 °C. Available in various configurations including front wall mount, rear wall mount, and jam nut receptacles, they offer reliable RFI grounding. With 9 shell sizes and 52 insert arrangements, these connectors utilize M39029 rear release crimp contacts for secure connections. Constructed with high-strength aluminum shells, they come with plating options such as cadmium and electroless nickel. These environmentally sealed connectors are ideal for military and industrial applications requiring durability and performance in challenging conditions.