MIL-DTL-38999 Series I connectors offer robust performance in harsh environments, featuring up to 128 contacts within an environmentally sealed insert. With an operating temperature range of -65 °C to 200 °C, these connectors are designed for durability. Available in various shell sizes and insert arrangements, they accommodate M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8, including coax and twinax options. The connectors come in high-strength aluminum shells with multiple plating choices such as cadmium finishes and electroless nickel, offering versatility in applications. Meeting military specification MIL-DTL-38999 I, they provide reliable connectivity with gold-plated contacts, ensuring conductivity. Suitable for box mounting with bayonet coupling, these receptacles are ideal for back panel installations, with options for RoHS-compliant finishes.