MIL-DTL-38999 Series I connectors feature up to 128 contacts within an environmentally sealed insert, designed for rugged applications with an operating temperature range of -65 °C to 200 °C. Offering versatility, these connectors come in various configurations including front and rear wall mount, jam nut receptacles, and RFI grounding plugs. With 9 shell sizes and 52 insert arrangements available, they utilize M39029 rear release crimp contacts for reliable connections. Constructed with high-strength aluminum shells, they come in plating options like cadmium and nickel for corrosion resistance. These connectors, meeting military specification MIL-DTL-38999 I, ensure durability in demanding environments.