MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert and are designed for harsh environments with an operating temperature range of -65°C to 200°C. The connector family includes front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs, offering versatility in installation. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts in various sizes, including coax and twinax. Constructed with high strength aluminum shells, these connectors come in multiple plating options such as electroless nickel and cadmium finishes. With RoHS certified cadmium-free options, they ensure compliance with environmental standards. Suitable for military and industrial applications, these connectors provide reliable performance with 500 mating cycles and conductive contact styles.