MIL-DTL-38999 Series II connectors offer robust performance in harsh environments with up to 128 contacts housed in an insert. These environmentally sealed connectors are designed for temperatures ranging from -65 °C to 200 °C, ensuring reliable operation in extreme conditions. Featuring various mounting options including front and rear wall mount, jam nut, and box mount receptacles, they provide versatility in installation. Available in 9 shell sizes and 52 insert arrangements, these connectors utilize M39029 rear release crimp contacts for secure connections. Constructed with aluminum shells and offering RoHS compliant plating options, such as electroless nickel and cadmium-free finishes, they meet stringent military specifications for durability and performance. Ideal for applications requiring high reliability, these connectors are designed for service in demanding environments, making them essential components in aerospace, defense, and industrial systems.