The MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an environmentally sealed insert. With an operating temperature range from -65°C to 200°C, these connectors offer reliable performance in extreme conditions. Available in various mounting styles, including front and rear wall mount, jam nut, and box mount receptacles, they provide flexibility in installation. The connectors come in 9 shell sizes and 52 insert arrangements, accommodating M39029 rear release crimp contacts. Constructed with aluminum shells and offering multiple plating options, such as cadmium and nickel, they ensure durability and corrosion resistance. These connectors, with gold-plated contacts, are RoHS compliant, making them suitable for a wide range of applications in military and industrial settings.