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 front wall mount, rear wall mount, and jam nut receptacles, they offer RFI grounding plugs and utilize M39029 rear release crimp contacts in various sizes. With 9 shell sizes and 52 insert arrangements, these connectors come in high strength aluminum shells with plating options including light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum. RoHS certified finishes are also available, making them suitable for a wide range of applications requiring reliable and durable electrical connections.