MIL-DTL-38999 Series I connectors offer robust connectivity solutions for harsh environments, featuring up to 128 contacts in an environmentally sealed insert. Designed for durability, they can operate in temperatures ranging from -65 °C to 200 °C. The connector family includes front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs, providing versatility in installation. With 9 shell sizes and 52 insert arrangements available, these connectors use M39029 rear release crimp contacts in various sizes, including coax and twinax. Constructed with high strength aluminum shells, they come in a range of plating options, such as cadmium and nickel, meeting different environmental requirements. Suitable for military and industrial applications, these connectors ensure reliable performance in demanding conditions.