MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in a sealed insert. With an operating temperature range of -65°C to 200°C, these connectors offer reliability in extreme conditions. Available in various shell sizes and insert arrangements, they utilize M39029 rear release crimp contacts, including sizes 22D, 22M, 22, 20, 16, and 8 for coax and twinax applications. The high-strength aluminum shells come with plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, catering to different environmental requirements. These connectors, including front wall mount, rear wall mount, and jam nut receptacles, feature RFI grounding plugs and bayonet coupling for secure connections. RoHS certified cadmium-free finishes are also available, ensuring compliance with environmental regulations. Suitable for military and industrial applications, MIL-DTL-38999 Series I connectors provide durable and efficient electrical connectivity.