MIL-DTL-38999 Series I connectors offer high-performance connectivity with up to 128 contacts, featuring a rugged design for harsh environments. These circular connectors are environmentally sealed, ensuring reliable operation in extreme conditions ranging from -65 °C to 200 °C. Available in various shell sizes and insert arrangements, they accommodate M39029 rear release crimp contacts in multiple sizes, including coax and twinax options. The connectors come in high-strength aluminum shells with a choice of plating finishes, such as gold and electroless nickel, meeting stringent military specifications for durability. With options for front wall mount, rear wall mount, and jam nut receptacles, they provide versatile installation solutions for diverse applications. RoHS compliant variants with cadmium-free finishes are also available, catering to environmental regulations. Designed for use in demanding settings, these MIL-DTL-38999 I connectors ensure secure and efficient electrical connections in critical systems.