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 front wall mount, rear wall mount, and jam nut receptacles, they offer RFI grounding plugs and utilize M39029 rear release crimp contacts. With nine shell sizes and 52 insert arrangements, they cater to various needs with options for plating such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum. These connectors, meeting MIL-DTL-38999 I specifications, are constructed with high strength aluminum shells and come in RoHS certified cadmium-free finishes, ensuring durability and compliance with environmental standards.