MIL-DTL-38999 Series II connectors offer robust connectivity solutions with up to 128 contacts in an environmentally sealed insert. Designed for harsh environments, these connectors feature various mounting options such as front wall mount, rear wall mount, and jam nut receptacles. With operating temperatures ranging from -65 °C to 200 °C, they provide reliable performance in extreme conditions. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts for secure connections. The aluminum shells come with plating options including cadmium and nickel for enhanced durability. RoHS certified finishes are also available, ensuring compliance with environmental standards. Perfect for military and industrial applications, these connectors offer high conductivity and ingress protection, making them ideal for use in demanding environments.