MIL-DTL-38999 Series I connectors, designed for harsh environments, feature front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs. With up to 128 contacts in an insert, they offer versatility in connectivity. Operating between -65 °C and 200 °C, these connectors are environmentally sealed for reliability. Utilizing M39029 rear release crimp contacts in various sizes, including coax and twinax, they ensure secure connections. Available in 9 shell sizes and 52 insert arrangements, they cater to diverse applications. With high strength aluminum shells and plating options such as cadmium-free finishes, electroless nickel, and anodized aluminum, they meet stringent requirements. The connectors, suitable for military and industrial use, guarantee longevity with 500 mating cycles. Their conductivity and ingress protection make them ideal for demanding settings.