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. Available in various mounting styles such as front and rear wall mount, jam nut, and box mount receptacles, these connectors offer versatility. With options for straight, RFI grounding, and standard plugs, they come in 9 shell sizes and 52 insert arrangements, accommodating M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 12. Constructed with aluminum shells and offering plating choices like cadmium and nickel, they ensure durability and performance. Suitable for military applications, these connectors are essential for reliable electrical connections in demanding environments.