MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an insert with environmental sealing. Operating between -65 °C and 200 °C, these connectors offer reliable performance in extreme conditions. Available in various shell sizes and plating options, including cadmium-free finishes, they meet RoHS certification standards for environmental compliance. The connectors come in aluminum shells with front wall mount, rear wall mount, and jam nut receptacles, offering versatility in installation. Utilizing M39029 rear release crimp contacts, they ensure secure connections. With a maximum operating temperature of 175 °C and a minimum of -65 °C, they are suitable for a wide range of applications.