MIL-DTL-38999 Series I connectors offer exceptional performance in harsh environments, featuring up to 128 contacts within a sealed insert. With an operating temperature range from -65°C to 200°C, these connectors ensure reliability in extreme conditions. Available in various shell sizes and insert arrangements, they accommodate M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8, including coax and twinax options. The high-strength aluminum shells come with a choice of plating, such as electroless nickel and cadmium finishes. Meeting military specification MIL-DTL-38999 I, these circular receptacles, with bayonet coupling, are ideal for back panel and box mounting applications, providing secure and efficient connectivity. With RoHS-certified cadmium-free options, they guarantee both performance and environmental compliance.