MIL-DTL-38999 Series I connectors with up to 128 contacts are designed for harsh environments, featuring front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs. These connectors, specified by MIL-DTL-38999 I, offer reliable performance in temperatures ranging from -65 °C to 200 °C. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in various sizes. Constructed with high-strength aluminum shells, they come in plating options such as cadmium and nickel, with RoHS compliant finishes. Suitable for military and industrial applications, these connectors ensure secure and durable electrical connections in demanding conditions.