MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, designed for harsh environments with operating temperatures ranging from -65 °C to 200 °C. These connectors offer various mounting options, including front and rear wall mount, jam nut, and box mount receptacles, with straight, RFI grounding, and standard plugs available. Compliant with military specifications, they utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 12. Constructed with aluminum shells and offering a selection of plating options such as electroless nickel and cadmium finishes, these connectors ensure reliable performance in demanding applications.