MIL-DTL-38999 Series II connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. These connectors come in various configurations, including front and rear wall mount, jam nut, and box mount receptacles, with options for straight, RFI grounding, and 90-degree cable clamp plugs. Compliant with military specification MIL-DTL-38999 II, they utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 12. The connectors, constructed with aluminum shells, offer multiple plating options such as electroless nickel, cadmium olive drab, and black anodized aluminum, with RoHS certified cadmium-free finishes available. Suitable for demanding applications, these connectors ensure reliable performance in rugged environments.