MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, designed for harsh environments with operating temperatures ranging from -65 °C to 200 °C. Available in various shell sizes and insert arrangements, they come in front wall mount, rear wall mount, and jam nut receptacle options, along with RFI grounding plugs. Constructed with high strength aluminum shells, they offer multiple plating choices including cadmium-free finishes. These circular connectors, meeting military specification MIL-DTL-38999 I, ensure reliable performance in demanding applications.