The MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating temperature range from -65 °C to 200 °C. Available in various shell sizes and insert arrangements, they offer rear release crimp contacts and come in high-strength aluminum shells with multiple plating options, including RoHS-certified finishes. The connector family includes front and rear wall mount, jam nut receptacles, and RFI grounding plugs, all meeting military specification MIL-DTL-38999 I. Perfect for applications requiring rugged and reliable electrical connections, these circular receptacles are ideal for box mounting and feature bayonet coupling.