MIL-DTL-38999 Series I 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. This connector family includes front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs, offering versatility in installation. With 9 shell sizes and 52 insert arrangements available, these connectors utilize M39029 rear release crimp contacts in various sizes, including coax and twinax options. Crafted from high-strength aluminum, they come in a range of plating choices such as cadmium-free finishes, ensuring reliable performance. Ideal for military and aerospace applications, these connectors meet stringent MIL-DTL-38999 I specifications, providing durable and secure electrical connections in demanding settings.