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 offers front and rear wall mount, as well as jam nut receptacles with RFI grounding plugs. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts in various sizes, including coax and twinax options. Constructed with high strength aluminum shells, they come with plating choices like light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS certified cadmium-free finishes. Ideal for military applications, these connectors ensure reliable performance with their gold-plated contacts, meeting stringent MIL-DTL-38999 I specifications.