MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various configurations including front wall mount, rear wall mount, and jam nut receptacles, they offer RFI grounding plugs for added versatility. With 9 shell sizes and 52 insert arrangements, these connectors utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8 (coax and twinax), ensuring reliable connectivity. Constructed with high-strength aluminum shells and offered in different plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, they cater to diverse application needs. The selection includes RoHS certified cadmium-free finishes, making them compliant with environmental regulations. Perfect for back panel box mounting with a crimp type, bayonet coupling design, these MIL-DTL-38999 I connectors are ideal for military and industrial applications requiring rugged, high-performance connectivity.