MIL-DTL-38999 Series I connectors offer reliable performance in harsh environments, with up to 128 contacts in an environmentally sealed insert. Operating at temperatures ranging from -65 °C to 200 °C, these connectors come in various shell sizes and insert arrangements, featuring front wall mount, rear wall mount, and jam nut receptacles. Utilizing M39029 rear release crimp contacts, they ensure secure connections in sizes 22D, 22M, 22, 20, 16, and 8 (coax and twinax). Constructed with high-strength aluminum shells and available in different plating options like light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, these connectors meet diverse application requirements. RoHS certified cadmium-free finishes are also offered, making them environmentally friendly choices for military and industrial applications.