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 as front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs, they offer versatility in installation. With 9 shell sizes and 52 insert arrangements, these connectors utilize M39029 rear release crimp contacts for reliable connections. Constructed with high-strength aluminum shells, they come in various plating options, including cadmium-free finishes, meeting RoHS certification. Suitable for military and industrial applications, these connectors ensure secure and durable electrical connections in demanding conditions.