MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs. With up to 128 contacts in an insert, these connectors are environmentally sealed and operate in temperatures ranging from -65 °C to 200 °C. Utilizing M39029 rear release crimp contacts, they come in 9 shell sizes and 52 insert arrangements, accommodating various contact sizes including coax and twinax. Constructed with high-strength aluminum shells and offered in plating options like electroless nickel and cadmium finishes, they ensure reliable performance. Suitable for military and industrial applications, these connectors meet MIL-DTL-38999 I specifications, guaranteeing durability and conductivity in demanding settings.