MIL-DTL-38999 Series I connectors offer robust performance in harsh environments with up to 128 contacts sealed for protection. Featuring a wide operating temperature range of -65 °C to 200 °C, these connectors come in various styles including front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. With 9 shell sizes and 52 insert arrangements available, they use M39029 rear release crimp contacts in multiple sizes. Constructed with high-strength aluminum shells and offering plating options such as cadmium and nickel, these connectors ensure reliable connectivity in demanding applications.