MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert that is environmentally sealed. With a wide operating temperature range of -65 °C to 200 °C, these connectors offer reliable performance in extreme conditions. Available in various mounting options including front wall mount, rear wall mount, jam nut, and box mount receptacles, they are versatile for different applications. The connectors come in aluminum shells with plating options such as cadmium and nickel, ensuring durability and corrosion resistance. Meeting military specification MIL-DTL-38999 II, they are suitable for use in demanding military and aerospace applications. With gold-plated contacts and a mating style of bayonet coupling, these connectors provide secure and efficient electrical connections.