The MIL-DTL-38999 Series I connectors feature up to 128 contacts housed in an insert and are designed for harsh environments with a wide operating temperature range of -65 °C to 200 °C. Offering front and rear wall mount options, as well as jam nut receptacles, these connectors provide reliable RFI grounding. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in various sizes, including coax and twinax. Constructed with high-strength aluminum shells and offering plating options such as electroless nickel, they meet stringent military specifications for durability and performance in demanding applications.