MIL-DTL-38999 Series I connectors feature up to 128 contacts housed 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 wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs, offering versatility in installation. With 9 shell sizes and 52 insert arrangements available, these connectors utilize M39029 rear release crimp contacts in various sizes, including coax and twinax options. Crafted from high-strength aluminum, they come in a range of plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, meeting diverse industrial needs. RoHS certified finishes are also available, ensuring environmental compliance. Perfect for military and aerospace applications, these connectors are reliable, with a service rating of E and a mating life of 500 cycles, making them ideal for demanding environments where conductivity and durability are essential.