MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts within an insert. These connectors are environmentally sealed, with a wide operating temperature range from -65 °C to 200 °C. Available in various configurations including front and rear wall mount, jam nut, and box mount receptacles, they offer versatility in installation. The plugs come in straight, RFI grounding, and standard options with a 90-degree cable clamp. With 9 shell sizes and 52 insert arrangements utilizing M39029 rear release crimp contacts, these connectors ensure secure and reliable connections. Constructed with aluminum shells and offering multiple plating options including cadmium-free finishes, they meet stringent requirements for military and industrial applications.