MIL-DTL-38999 Series I connectors offer high-performance connectivity with up to 128 contacts, featuring durable environmentally sealed inserts. Designed for harsh environments, these connectors operate flawlessly in temperatures ranging from -65 °C to 200 °C. Available in various configurations including front wall mount, rear wall mount, and jam nut receptacles, they ensure secure connections in demanding applications. The connectors come in 9 shell sizes and 52 insert arrangements, accommodating M39029 rear release crimp contacts in multiple sizes. Constructed with high-strength aluminum shells, they offer reliability and longevity. Various plating options such as electroless nickel and cadmium finishes cater to different environmental requirements. RoHS compliant versions are also available, making them suitable for a wide range of applications requiring robust and dependable connectivity.