MIL-DTL-38999 Series I connectors offer up to 128 contacts within an insert, designed for harsh environmental conditions with operating temperatures ranging from -65 °C to 200 °C. Featuring front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs, these connectors provide versatile connectivity solutions. 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 finishes such as cadmium-free options, ensuring durability and performance. Suitable for military and industrial applications, these connectors meet MIL-DTL-38999 I specifications, offering reliable electrical connections in demanding settings.