The 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 with RFI grounding plugs. Constructed with high-strength aluminum shells and offering a selection of plating options including cadmium-free finishes, these connectors ensure reliable performance in demanding applications. Utilizing M39029 rear release crimp contacts, they provide secure connections with gold plating for enhanced conductivity. With a bayonet coupling and back panel box mounting flange, they cater to military specifications for rugged performance.