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. The connector family includes front wall mount, rear wall mount, and jam nut receptacles, as well as RFI grounding plugs. With 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in various sizes. These connectors come in high-strength aluminum shells with options for plating such as cadmium and nickel finishes, meeting RoHS certification standards. Ideal for military and industrial applications, they provide reliable connectivity in demanding conditions.