MIL-DTL-38999 Series I connectors feature up to 128 contacts housed in an insert, providing robust environmental sealing for reliable performance in harsh conditions. With an operating temperature range spanning from -65 °C to 200 °C, these connectors are designed to withstand extreme environments. The connector family includes front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs, offering versatility in installation. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in various sizes, including coax and twinax options. Constructed with high-strength aluminum shells, they come in a range of plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, catering to different application requirements. These connectors are ideal for military and aerospace applications, ensuring secure and reliable electrical connections in demanding environments.