MIL-DTL-38999 Series II connectors are designed for harsh environments, offering up to 128 contacts in an insert for reliable electrical connections. With a wide operating temperature range from -65 °C to 200 °C, they are suitable for various applications. These connectors come in different configurations, including front wall mount, rear wall mount, jam nut, and box mount receptacles, providing versatility in installation. Featuring aluminum shells and various plating options such as gold, electroless nickel, and cadmium finishes, they ensure durability and performance. Compliant with military specifications, these circular connectors are ideal for demanding environments where reliability is paramount.