MIL-DTL-38999 Series I connectors feature up to 128 contacts in environmentally sealed inserts, designed for harsh environments with an operating temperature range from -65 °C to 200 °C. Offering front wall mount, rear wall mount, and jam nut receptacles, this connector family includes RFI grounding plugs and comes in 9 shell sizes with 52 insert arrangements. Utilizing M39029 rear release crimp contacts, they are ideal for various applications, including sizes 22D, 22M, 22, 20, 16, and 8 (coax and twinax). Constructed with high-strength aluminum shells, they offer a choice of plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS certified cadmium-free finishes available. These connectors, designed to MIL-DTL-38999 I specifications, ensure reliable performance with gold-plated contacts, bayonet coupling, and N-keyway polarization, suitable for demanding military and industrial environments.