MIL-DTL-38999 Series I connectors feature up to 128 contacts in a sealed insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in wall mount and jam nut receptacles with RFI grounding plugs, they offer versatility with 9 shell sizes and 52 insert arrangements. Utilizing M39029 rear release crimp contacts in various sizes, including coax and twinax, these connectors ensure reliable connections. Constructed with high-strength aluminum shells and offered in different plating options, such as cadmium-free finishes, they meet RoHS compliance standards. Suitable for military and industrial applications, these circular connectors provide durability and performance in demanding environments.