MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various configurations including front wall mount, rear wall mount, and jam nut receptacles, they offer RFI grounding plugs and utilize M39029 rear release crimp contacts. With options for 9 shell sizes and 52 insert arrangements, these connectors come in high-strength aluminum shells with plating choices like cadmium finishes or RoHS-certified alternatives. Suitable for military and industrial applications, these connectors provide reliable performance in demanding conditions.