MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert with environmental sealing. Operating between -65 °C and 200 °C, these connectors come in various configurations including front and rear wall mount, jam nut, and box mount receptacles. Offering straight, RFI grounding, and standard plugs with a 90-degree cable clamp, they accommodate M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 12. Constructed with aluminum shells and available in different plating options such as cadmium and electroless nickel, these connectors ensure reliable performance in demanding applications.