The MIL-DTL-38999 Series I connectors feature up to 128 contacts housed in an insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various configurations such as front and rear wall mount, as well as jam nut receptacles, they offer RFI grounding plugs for added functionality. With 9 shell sizes and 52 insert arrangements, these connectors utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8, 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 available. The connectors, compliant with military specification MIL-DTL-38999 I, ensure reliable performance in demanding applications, featuring a straight plug design with gold-plated contacts for optimal conductivity. Their bayonet mating type and N keyway polarization offer secure and efficient connections, with a service rating of II for enhanced durability. Suitable for environment-resistant wall and jam nut mounting receptacle and plug types, they are ideal for a wide range of industrial and military applications.