MIL-DTL-38999 Series I connectors offer robust performance in harsh environments, featuring up to 128 contacts in an environmentally sealed insert. With an operating temperature range from -65 °C to 200 °C, they are suitable for a wide range of applications. Available in various shell sizes and insert arrangements, these circular receptacles come in high-strength aluminum shells with options for different plating finishes, including RoHS-certified cadmium-free coatings. The connectors, meeting military specification MIL-DTL-38999 I, are designed for box mounting with bayonet coupling, and utilize M39029 rear release crimp contacts for secure connections. The versatility and reliability of these connectors make them ideal for demanding military and industrial environments.