The MIL-DTL-38999 Series I connectors offer reliable connectivity in harsh environments with up to 128 contacts housed in an insert. Designed for durability, these circular receptacles feature front and rear wall mount options, as well as jam nut mounting for secure installation. With a wide operating temperature range from -65°C to 200°C, they are suitable for various applications. The connectors utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8, including coax and twinax configurations. Constructed with high-strength aluminum shells and available in different plating options, such as gold, electroless nickel, and cadmium-free finishes, they ensure optimal performance and longevity. Meeting MIL-DTL-38999 I military specifications, these connectors guarantee reliable and efficient electrical connections in demanding conditions.