The MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts within an insert. These circular connectors are front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs, suitable for a wide range of applications. With a temperature range of -65 °C to 200 °C, they offer reliable performance in extreme conditions. Available in 9 shell sizes and 52 insert arrangements, these connectors use M39029 rear release crimp contacts, ensuring secure connections. Constructed with high-strength aluminum shells, they come in various plating options, including cadmium-free finishes for RoHS compliance. Perfect for military and industrial use, these connectors provide durability and conductivity, meeting stringent performance standards.