MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts within an insert. With environmental sealing and an operating temperature range from -65 °C to 200 °C, they ensure reliability in various conditions. These connectors come in different configurations such as front and rear wall mount, jam nut, and box mount receptacles, offering versatility in installation. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts for secure connections. Constructed with aluminum shells and various plating options including cadmium and nickel, they meet stringent military specifications. Ideal for aerospace, defense, and industrial applications, these connectors guarantee durability and performance in demanding settings.