The MIL-DTL-38999 Series II connectors offer high-performance connectivity with up to 128 contacts in an insert, designed for harsh environments. These environmentally sealed connectors feature a wide operating temperature range from -65 °C to 200 °C, ensuring reliable performance in extreme conditions. Available in various mount types including front wall, rear wall, jam nut, and box mount receptacles, they cater to diverse installation needs. With options for straight, RFI grounding, and standard plugs, along with 52 insert arrangements, these connectors provide flexibility for different applications. Utilizing M39029 rear release crimp contacts, they guarantee secure and efficient connections. Made with aluminum shells and offered in multiple plating options, including cadmium-free finishes, they meet stringent environmental standards. The connectors, boasting a service rating of I and service class E, are ideal for demanding military and industrial applications requiring rugged and durable connectivity solutions.