MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. These connectors, with various mounting options including front wall, rear wall, jam nut, and box mount receptacles, offer versatility in installation. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 12. Constructed with aluminum shells and offering multiple plating options, including cadmium-free finishes, these connectors ensure reliable performance. The crimp type, bayonet coupling design, and gold contact plating guarantee secure and efficient electrical connections. Suitable for military and aerospace applications, they meet MIL-DTL-38999 II specifications, with a service rating of I for environmental resistance.