MIL-DTL-38999 Series II connectors are rugged and reliable, featuring up to 128 contacts in an environmentally sealed insert. Designed for harsh environments, they offer a wide operating temperature range from -65 °C to 200 °C. These connectors come in various configurations including front wall mount, rear wall mount, jam nut, and box mount receptacles, with options for straight, RFI grounding, and standard plugs. With 9 shell sizes and 52 insert arrangements available, they use M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 12. Constructed with aluminum shells and offering plating options like electroless nickel and cadmium finishes, they meet stringent military specifications for durability. Perfect for demanding applications, these connectors ensure secure and efficient electrical connections in challenging conditions.