The MIL-DTL-38999 Series I connectors offer robust connectivity with up to 128 contacts in an environmentally sealed insert. Designed for harsh environments, they feature various mounting options like front wall, rear wall, and jam nut receptacles, all with RFI grounding plugs. With nine shell sizes and 52 insert arrangements, these connectors use M39029 rear release crimp contacts, ensuring secure connections. Constructed with high-strength aluminum shells and available in different plating options, including cadmium-free finishes, they guarantee reliability in extreme conditions. Operating between -65°C and 200°C, these connectors are ideal for demanding applications in military and industrial settings.