MIL-DTL-38999 Series II connectors feature up to 128 contacts in an environmentally-sealed insert, designed for harsh environments with operating temperatures ranging from -65 °C to 200 °C. Offering various mounting options including front and rear wall mount, jam nut, and box mount receptacles, they ensure secure connectivity. With 52 insert arrangements and M39029 rear release crimp contacts in different sizes, these connectors provide versatility. Constructed with aluminum shells and available in multiple plating options, such as electroless nickel and cadmium, they guarantee durability. The RoHS compliant finishes cater to environmental regulations, making them ideal for military and industrial applications.