MIL-DTL-38999 Series I connectors feature up to 128 contacts housed in an insert, designed for harsh environments with a wide operating temperature range from -65 °C to 200 °C. Available in various configurations such as front and rear wall mount, as well as jam nut receptacles, they offer reliable connectivity with RFI grounding options. Compliant with military specifications, these circular connectors come in 9 shell sizes and 52 insert arrangements, using M39029 rear release crimp contacts. Constructed with high strength aluminum shells, they come in different plating options including cadmium-free finishes for RoHS compliance, ensuring durability and performance in demanding applications.