MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Offering front wall mount, rear wall mount, and jam nut receptacles, they provide RFI grounding plugs with 9 shell sizes and 52 insert arrangements. Utilizing M39029 rear release crimp contacts in various sizes, including coax and twinax, these connectors come in high-strength aluminum shells with plating options such as cadmium and nickel. RoHS certified finishes are available, ensuring environmental compliance. Ideal for military and aerospace applications, they boast a service rating of E with 500 mating cycles and conductive conductivity.