MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert and offering reliable performance in temperatures ranging from -65 °C to 200 °C. These environmentally sealed connectors come in various configurations, including front wall mount, rear wall mount, jam nut, and box mount receptacles. With options for straight, RFI grounding, and standard plugs, they cater to diverse connectivity needs. Utilizing M39029 rear release crimp contacts, they ensure secure connections in sizes 22D, 22M, 22, 20, 16, and 12. Constructed with aluminum shells and available in different plating options like cadmium and nickel, they meet stringent military specifications. Suitable for applications requiring durability and performance, these connectors offer a reliable solution for demanding environments.