The MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an environmentally sealed insert. With a wide operating temperature range of -65 °C to 200 °C, they offer reliable performance in extreme conditions. Available in various shell sizes and insert arrangements, these connectors come in high-strength aluminum shells with options for plating, including cadmium-free finishes. The receptacles, which include front and rear wall mount as well as jam nut options, use M39029 rear release crimp contacts for secure connections. Meeting military specifications, they ensure durability and conductivity, making them suitable for demanding applications.