MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert. These connectors are environmentally sealed, with an operating temperature range from -65 °C to 200 °C. Available in various configurations including front wall mount, rear wall mount, jam nut, and box mount receptacles, they offer versatility for different applications. The connectors come in aluminum shells with options for plating such as electroless nickel and cadmium finishes. With RoHS compliant versions available, these connectors ensure reliability and performance in demanding military and industrial settings.