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. This connector family includes front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. Offered in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts in various sizes. Constructed with high-strength aluminum shells, they come with plating options such as cadmium and nickel, ensuring durability. These circular connectors, meeting MIL-DTL-38999 I specifications, are ideal for military and aerospace applications, providing reliable performance in demanding conditions.