The MIL-DTL-38999 Series I connectors offer reliable connectivity in harsh environments, featuring up to 128 contacts housed within an insert. With front and rear wall mount options, as well as jam nut receptacles and RFI grounding plugs, these connectors provide versatile installation solutions. Built to withstand extreme temperatures ranging from -65°C to 200°C, they ensure consistent performance in demanding conditions. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts for secure connections. Constructed with high strength aluminum shells, they come with various plating options, including cadmium-free finishes for RoHS compliance. Designed for military specification MIL-DTL-38999 I, these circular receptacles guarantee durability and conductivity, making them ideal for aerospace, defense, and other rugged applications.