MIL-DTL-38999 Series I connectors boast up to 128 contacts within an insert, offering robust environmental sealing for reliable performance. Operating seamlessly in extreme temperatures ranging from -65 °C to 200 °C, these connectors come in various configurations including front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. With 9 shell sizes and 52 insert arrangements available, they accommodate M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8 (coax and twinax). Constructed with high-strength aluminum shells, they feature plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, catering to diverse application needs. Each connector undergoes rigorous testing to ensure quality and reliability, making them ideal for demanding military and industrial environments.