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 from -65°C to 200°C. Offering front and rear wall mount options, as well as jam nut receptacles and RFI grounding plugs, they provide versatility in connectivity solutions. With 9 shell sizes and 52 insert arrangements available, they utilize M39029 rear release crimp contacts in various sizes, including coax and twinax. Constructed with high-strength aluminum shells, these connectors come with plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, catering to different application needs. Meeting MIL-DTL-38999 I military specifications, they ensure reliable performance in demanding settings.