MIL-DTL-38999 Series I connectors offer high-performance connectivity with up to 128 contacts in an environmentally sealed insert. Designed for harsh environments, they feature front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. With 9 shell sizes and 52 insert arrangements, these connectors utilize M39029 rear release crimp contacts for secure connections. Constructed with high-strength aluminum shells, they are available in various plating options, including cadmium-free finishes. Operating between -65 °C and 200 °C, these connectors are ideal for demanding applications requiring reliable performance.