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 styles including front and rear wall mount, jam nut, and box mount receptacles, these connectors offer versatility in applications. The plugs, offered in straight, RFI grounding, and standard options, come with 90-degree cable clamps for secure installations. With 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 12, ensuring reliable connections. Constructed with aluminum shells and offering multiple plating options such as electroless nickel and cadmium finishes, these connectors meet stringent military specifications for durability and performance in demanding environments.