MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert with environmental sealing. Suitable for a wide temperature range from -65 °C to 200 °C, these connectors come in various configurations including front and rear wall mount, jam nut, and box mount receptacles. With options for straight, RFI grounding, and standard plugs, they offer versatility in connectivity solutions. Compliant with military specification MIL-DTL-38999 II, these circular plugs ensure reliable performance with gold-plated contacts and durable aluminum shells. Available in different plating options such as electroless nickel and cadmium finishes, they cater to various application needs while meeting environmental standards.