MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, offering environmental sealing and a wide operating temperature range from -65°C to 200°C. This connector family includes 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 utilize M39029 rear release crimp contacts in various sizes, including coax and twinax options. Constructed with high-strength aluminum shells, these connectors come with plating choices such as cadmium, nickel, and anodized finishes, including RoHS-certified cadmium-free options. Suitable for harsh environments, they meet MIL-DTL-38999 I specifications, ensuring reliability and performance in demanding applications.