MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, offering environmental sealing and a wide operating temperature range from -65 °C to 200 °C. These harsh environment connectors come in various configurations such as front wall mount, rear wall mount, jam nut, and box mount receptacles, with options for straight, RFI grounding, and 90-degree cable clamp plugs. With 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 12. Crafted from aluminum, they come with plating choices including cadmium-free finishes. Ideal for military and industrial applications, these connectors ensure reliable performance in demanding environments.