MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an insert. These connectors are environmentally sealed, with an operating temperature range of -65 °C to 200 °C. Available in various shell sizes and insert arrangements, they utilize M39029 rear release crimp contacts for reliable connections. The high strength aluminum shells come in different plating options, including cadmium-free finishes. With options for front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs, these connectors offer versatility for military and industrial applications.