MIL-DTL-38999 Series I connectors, featuring up to 128 contacts in an insert, are designed for harsh environments with a wide operating temperature range of -65 °C to 200 °C. These environmentally sealed connectors come in various configurations including front and rear wall mount, jam nut receptacles, and RFI grounding plugs. With 9 shell sizes and 52 insert arrangements, they accommodate M39029 rear release crimp contacts in different sizes, offering versatility in applications. Constructed with high-strength aluminum shells, they are available in multiple plating options such as cadmium and nickel for enhanced durability. RoHS compliant finishes ensure environmental responsibility, making them ideal for military and industrial use.