MIL-DTL-38999 Series II connectors offer high-performance connectivity with up to 128 contacts in an environmentally sealed insert. Designed for harsh environments, these connectors feature various mounting options, including front and rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts for secure connections. Crafted from aluminum, these connectors come in plating options such as cadmium and electroless nickel, ensuring durability and reliability. With a wide operating temperature range of -65 °C to 200 °C, they are suitable for diverse applications. Meeting military specification MIL-DTL-38999 II, these circular receptacles are ideal for demanding environments where rugged performance is essential.