MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, designed for harsh environments with an operating temperature range of -65°C to 200°C. Available in various shell sizes and insert arrangements, they offer front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. Utilizing M39029 rear release crimp contacts, including coax and twinax options, these connectors boast high strength aluminum shells with plating choices like cadmium and nickel. RoHS certified finishes are also available, catering to diverse application needs. With a bayonet coupling and environmentally sealed construction, they ensure reliable performance in demanding settings.