MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert and an 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, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts for reliable connections. Constructed with aluminum shells and offered with plating options such as cadmium and nickel, these connectors ensure durability and performance in demanding applications. With RoHS certified finishes available, they meet stringent environmental standards. The MS27484 model is a straight plug with EMI shielding, gold contact plating, and a service rating of I, suitable for military and industrial use.