MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, providing robust environmental sealing and operating efficiently in temperatures ranging from -65 °C to 200 °C. This connector family includes front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs, ensuring versatile connectivity options. With 9 shell sizes and 52 insert arrangements available, these connectors utilize M39029 rear release crimp contacts in various sizes for optimal performance. Constructed with high strength aluminum shells, they offer multiple plating options such as cadmium and nickel finishes, catering to diverse industrial needs. These connectors, certified for RoHS compliance, are ideal for applications requiring reliable and durable electrical connections in harsh environments.