The MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an environmentally sealed insert. With an operating temperature range of -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 installation needs. The connectors, made of aluminum, come in 9 shell sizes with 52 insert arrangements, accommodating M39029 rear release crimp contacts. Plating options such as gold, electroless nickel, and cadmium finishes ensure durability and corrosion resistance. Meeting military specification MIL-DTL-38999 II, these circular connectors are ideal for applications requiring rugged and dependable connectivity.