The MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts within an environmentally sealed insert. With an operating temperature range from -65°C to 200°C, these connectors ensure reliable performance in extreme conditions. Available in various mounting styles including front and rear wall mount, jam nut, and box mount receptacles, they offer versatility for different applications. The connectors come in aluminum shells with options for plating such as gold, electroless nickel, and cadmium-free finishes, meeting RoHS compliance. Utilizing M39029 rear release crimp contacts, they provide secure connections with mating cycles of up to 500. Suitable for military and industrial use, these connectors guarantee conductivity and ingress protection, making them ideal for demanding environments.