MIL-DTL-38999 Series II connectors are designed for harsh environments, offering up to 128 contacts in an insert. These environmentally sealed connectors have a wide operating temperature range from -65 °C to 200 °C. Featuring various mounting options such as front wall mount, rear wall mount, jam nut, and box mount receptacles, they provide flexibility for different applications. With 52 insert arrangements and utilizing M39029 rear release crimp contacts, these connectors ensure reliable connectivity. Made with aluminum shells and available in different plating options including cadmium-free finishes, they meet RoHS compliance standards. Ideal for military and industrial use, these connectors are durable and efficient, with a service rating of I.