MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, designed for harsh environments with a wide operating temperature range of -65 °C to 200 °C. Offering front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs, they provide versatile connectivity options. With 9 shell sizes and 52 insert arrangements, these connectors use M39029 rear release crimp contacts in various sizes, including coax and twinax. Constructed with high-strength aluminum shells, they come in plating options such as cadmium and nickel for durability. RoHS certified finishes are available, ensuring compliance with environmental regulations. Ideal for military and industrial applications, these connectors guarantee reliable performance in demanding conditions.