MIL-DTL-38999 Series I connectors offer robust connectivity with up to 128 contacts in an environmentally sealed insert. Designed for harsh environments, they feature front and rear wall mount options, as well as jam nut receptacles with RFI grounding plugs. Compliant with military specification MIL-DTL-38999 I, these connectors ensure reliable performance in a wide temperature range from -65 °C to 200 °C. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts, including sizes 22D, 22M, 22, 20, 16, and 8 for coax and twinax applications. Constructed with high-strength aluminum shells, they come in various plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS certified cadmium-free finishes. Ideal for demanding applications, these connectors combine durability, conductivity, and environmental resistance.