The MIL-DTL-38999 Series I connectors feature up to 128 contacts within an insert, offering environmental sealing and a wide operating temperature range of -65 °C to 200 °C. Designed for harsh environments, they come in various configurations including front and rear wall mount receptacles, jam nut receptacles, and RFI grounding plugs. With 9 shell sizes and 52 insert arrangements available, these connectors use M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8 (coax and twinax). Constructed with high-strength aluminum shells, they offer multiple plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, including RoHS certified cadmium-free finishes. Perfect for military and industrial applications, they provide reliable connectivity in demanding conditions.