MIL-DTL-38999 Series I connectors boast a rugged design with up to 128 contacts housed in a sealed insert, ideal for harsh environments. Operating smoothly within a wide temperature range of -65 °C to 200 °C, these connectors come in various mounting options such as front and rear wall mounts, along with jam nut receptacles and RFI grounding plugs. Featuring 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in different sizes, including coax and twinax. Constructed with high-strength aluminum shells, they offer versatile plating options like cadmium finishes and electroless nickel. These connectors, compliant with RoHS regulations, ensure reliable performance in demanding applications.