MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert with an operating temperature range of -65 °C to 200 °C. This harsh environment connector family includes front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts in various sizes. Constructed with high-strength aluminum shells, these connectors offer plating options such as cadmium and nickel, with RoHS compliant finishes. Ideal for military and industrial applications, they ensure reliable performance in demanding conditions.