MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed 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 receptacle options, with RFI grounding plugs. Constructed with high strength aluminum shells, they offer multiple plating choices including cadmium-free finishes. Utilizing M39029 rear release crimp contacts, they ensure reliable connectivity, ideal for military and aerospace applications requiring durability and performance in challenging conditions.