The MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an environmentally sealed insert. With a wide operating temperature range from -65 °C to 200 °C, these connectors offer reliable performance in extreme conditions. Available in various mounting options including front and rear wall mount, jam nut, and box mount receptacles, they cater to diverse connectivity needs. The aluminum shells come in different plating options such as electroless nickel and cadmium finishes, ensuring durability and corrosion resistance. Compliant with military specification MIL-DTL-38999 II, these circular connectors provide secure mating with bayonet coupling. Suitable for back panel installations, they are ideal for applications requiring rugged and dependable electrical connections in aerospace, defense, and industrial settings.