MIL-DTL-38999 Series I connectors offer robust functionality for harsh environments, featuring up to 128 contacts in an insert with environmental sealing. Designed for durability, they operate in temperatures ranging from -65 °C to 200 °C. The 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, they accommodate various needs, utilizing M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8. These connectors come in high-strength aluminum shells with multiple plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, offering flexibility in application. Additionally, RoHS certified cadmium-free finishes are available, aligning with environmental regulations. Perfect for military and industrial applications, the MIL-DTL-38999 I connectors provide reliable performance with their rugged construction and efficient signal transmission capabilities.