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. With front wall mount, rear wall mount, and jam nut receptacles, they offer versatility in installation. The connector family includes various shell sizes and insert arrangements, using M39029 rear release crimp contacts. Constructed with high-strength aluminum shells, they come in plating options such as cadmium and nickel. These connectors are ideal for military and industrial applications requiring reliable performance in challenging conditions.