MIL-DTL-38999 Series I connectors offer rugged performance with up to 128 contacts in an environmentally sealed insert. Designed for harsh environments, they feature front and rear wall mount options, as well as jam nut receptacles with RFI grounding plugs. With operating temperatures ranging from -65 °C to 200 °C, these connectors are suitable for a wide range of applications. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts in various sizes, including coax and twinax. Constructed with high-strength aluminum shells, they come in multiple plating options, including cadmium-free finishes for RoHS compliance. Ideal for military and industrial use, these connectors provide reliable connectivity in demanding conditions.