MIL-DTL-38999 Series I connectors offer robust connectivity with up to 128 contacts, environmentally sealed for reliable performance in harsh conditions. Operating seamlessly in temperatures ranging from -65°C to 200°C, these connectors come in various configurations including front and rear wall mount receptacles and jam nut receptacles, all featuring RFI grounding plugs. With 9 shell sizes and 52 insert arrangements, they accommodate M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8. Constructed with high-strength aluminum shells, they are available in plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS certified cadmium-free finishes. Meeting MIL-DTL-38999 I military specifications, these circular connectors ensure secure and durable electrical connections in demanding environments.