MIL-DTL-38999 Series I connectors are rugged and reliable with up to 128 contacts, offering exceptional performance in harsh environments. These circular receptacles, featuring front wall mount, rear wall mount, and jam nut options, are designed for military and aerospace applications. With a wide operating temperature range of -65°C to 200°C, they ensure consistent functionality in extreme conditions. Utilizing M39029 rear release crimp contacts, these connectors come in 9 shell sizes and 52 insert arrangements. Constructed with high-strength aluminum shells and available in various plating options, including RoHS-certified finishes, they guarantee durability and corrosion resistance. Suitable for box mounting installation, they provide secure electrical connections with gold-plated contacts. Meeting MIL-DTL-38999 I specifications, these connectors are essential for critical communication and power systems in demanding environments.