MIL-DTL-38999 Series I connectors offer high-performance connectivity in harsh environments, featuring up to 128 contacts in a rugged insert. These circular connectors, designed for military applications, boast front and rear wall mount options, as well as jam nut receptacles with RFI grounding plugs. With a broad range of shell sizes and insert arrangements, they accommodate M39029 rear release crimp contacts in various sizes, including coax and twinax. Constructed with durable high-strength aluminum shells and available in different plating options, such as cadmium and nickel, these connectors ensure reliable performance in extreme conditions. With RoHS compliant finishes, they guarantee environmental responsibility without compromising functionality. Ideal for demanding military and aerospace applications, MIL-DTL-38999 Series I connectors provide secure and efficient electrical connections with a service rating of I, offering a maximum operating temperature of 175°C and a minimum of -65°C.