MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with a wide operating temperature range of -65 °C to 200 °C. Available in various mounting options like front wall, rear wall, and jam nut receptacles, they offer reliable connectivity with RFI grounding plugs. With 9 shell sizes and 52 insert arrangements, these connectors utilize M39029 rear release crimp contacts in multiple sizes, including coax and twinax. Constructed with high-strength aluminum shells, they come in plating options like cadmium and electroless nickel. RoHS compliant finishes ensure environmental responsibility. Perfect for military and industrial applications, these connectors guarantee durability and performance in demanding conditions.