The MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an insert with environmental sealing. These connectors are suitable for a wide temperature range, from -65 °C to 200 °C, and come in various mounting options such as front wall mount, rear wall mount, and jam nut receptacles. With 9 shell sizes and 52 insert arrangements available, they offer flexibility for different applications. Utilizing M39029 rear release crimp contacts, these connectors ensure reliable connections. Made from high-strength aluminum, they are offered with a choice of plating options, including cadmium-free finishes for RoHS compliance. The connectors are MIL-DTL-38999 I compliant, meeting stringent military specifications for performance and durability in demanding environments.