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 mount, rear wall mount, and jam nut receptacles, they offer RFI grounding plugs. 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. Crafted from high-strength aluminum, they come with plating options like light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, ensuring durability. RoHS compliant finishes are also available, making them suitable for a wide range of applications requiring reliable connectivity in demanding conditions.