MIL-DTL-38999 Series I connectors feature up to 128 contacts housed in an insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various shell sizes and insert arrangements, these connectors come in front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs. Crafted from high-strength aluminum, they offer durability and reliability, with multiple plating options including cadmium-free finishes. Meeting stringent military specifications, these circular receptacles are ideal for applications requiring secure and efficient electrical connections in challenging conditions.