MIL-DTL-38999 Series I connectors offer high-performance connectivity with up to 128 contacts in a durable insert. Designed for harsh environments, these connectors are environmentally sealed and can operate in temperatures ranging from -65 °C to 200 °C. Available in various configurations including front wall mount, rear wall mount, and jam nut receptacles, they feature RFI grounding plugs for added versatility. With 9 shell sizes and 52 insert arrangements to choose from, these connectors use M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8, including coax and twinax options. Constructed with high-strength aluminum shells and offered in a range of plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, they meet diverse application needs. Select models are RoHS certified for environmentally conscious operations, making them ideal for demanding military and industrial settings.