The MIL-DTL-38999 Series II connectors are designed for harsh environments, offering up to 128 contacts in an environmentally sealed insert. With an operating temperature range from -65 °C to 200 °C, these connectors are ideal for rugged applications. Available in various mounting options such as front wall mount, rear wall mount, jam nut, rear box mount, and front box mount receptacles, they provide versatility in installation. Featuring 52 insert arrangements and utilizing M39029 rear release crimp contacts, these connectors ensure reliable connectivity. Constructed with aluminum shells and plated with options like cadmium and nickel, they offer durability and corrosion resistance. These connectors are RoHS compliant, meeting environmental standards for a sustainable future.