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. These connectors come in various configurations like front and rear wall mount, jam nut receptacles, and RFI grounding plugs. With 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8. Built with high-strength aluminum shells, they offer plating options including cadmium finishes and RoHS-certified alternatives. Suitable for military and industrial applications, these connectors ensure reliable performance with their conductive contact style and environment-resistant design.