The MIL-DTL-38999 Series II connectors are designed for harsh environments, with up to 128 contacts in an insert. These connectors, featuring various mounting options like front and rear wall mount, jam nut, and box mount receptacles, are ideal for military and aerospace applications. With a wide operating temperature range of -65 °C to 200 °C, they offer reliable performance in extreme conditions. Made of aluminum with options for plating finishes, including RoHS compliant versions, they ensure durability and corrosion resistance. The connectors use M39029 rear release crimp contacts, providing secure connections. Suitable for both male and female contacts, with gold plating for enhanced conductivity, they offer 500 mating cycles. Overall, the MIL-DTL-38999 Series II connectors meet stringent military specifications for performance and reliability in demanding environments.