The 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 in various mounting options including front wall, rear wall, and jam nut receptacles, they offer RFI grounding plugs for added versatility. With 9 shell sizes and 52 insert arrangements utilizing M39029 rear release crimp contacts, these connectors ensure reliable performance. Constructed with high strength aluminum shells and offering multiple plating options, including RoHS-certified finishes, they provide durability and compliance with environmental regulations. Perfect for military and aerospace applications, these connectors are essential for secure and efficient electrical connections in demanding settings.