The MIL-DTL-38999 Series II connectors are designed for harsh environments, with up to 128 contacts in each insert. These connectors are front wall mount, rear wall mount, jam nut, rear box mount, and front box mount (long grommet) receptacles, making them versatile for various applications. With an operating temperature range of -65 °C to 200 °C, they are suitable for use in extreme conditions. Featuring aluminum shells with options for plating including electroless nickel and cadmium finishes, these connectors offer durability and reliability. They utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 12, ensuring secure connections. RoHS compliant options are available, meeting environmental standards. Perfect for military and industrial use, these connectors provide high-performance connectivity in demanding environments.