MIL-DTL-38999 Series I connectors offer reliable connectivity in harsh environments with up to 128 contacts. These environmentally sealed connectors have a wide operating temperature range from -65°C to 200°C. Available in various mounting styles including front wall mount, rear wall mount, and jam nut receptacles, they feature RFI grounding plugs for enhanced performance. With 9 shell sizes and 52 insert arrangements, they accommodate M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8. Constructed with high strength aluminum shells, they come in different plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS certified cadmium-free finishes available. Perfect for military applications, these connectors ensure durability and conductivity with a mating life of 500 cycles, making them ideal for demanding environments.