MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, offering environmental sealing and a wide operating temperature range of -65 °C to 200 °C. This harsh environment connector family includes front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. With 9 shell sizes and 52 insert arrangements available, they utilize M39029 rear release crimp contacts in various sizes. The connectors come in high-strength aluminum shells with plating options like cadmium and nickel. RoHS-certified finishes are also offered, ensuring compliance with environmental regulations. Ideal for military and industrial applications, these connectors provide reliable connectivity in demanding conditions.