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. Available in various mounting options including front wall, rear wall, and jam nut receptacles, they offer RFI grounding plugs for enhanced performance. With 9 shell sizes and 52 insert arrangements, these connectors utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8, catering to diverse connectivity needs. Crafted from high-strength aluminum, they come with plating choices like cadmium and nickel for durability. RoHS compliant options are also available, making them ideal for a wide range of applications requiring reliable, military-grade connectivity.