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. This connector family includes front and rear wall mount, as well as jam nut receptacles with RFI grounding plugs, offering versatility for various applications. Compliant with military specification MIL-DTL-38999, these connectors come in 9 shell sizes and 52 insert arrangements, utilizing M39029 rear release crimp contacts. Constructed with high-strength aluminum shells, they are available in different plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum. With RoHS certified cadmium-free finishes, these connectors meet stringent environmental standards, making them ideal for demanding industrial and military environments.