The MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert and offering front and rear wall mount, jam nut, and box mount receptacles. With a wide operating temperature range from -65 °C to 200 °C, these connectors are ideal for demanding applications. They come in various shell sizes and insert arrangements, utilizing M39029 rear release crimp contacts. Constructed with aluminum shells and available in different plating options, including cadmium-free finishes, they ensure durability and reliability. Meeting military specification MIL-DTL-38999 II, these circular connectors are essential for rugged and high-performance electrical connections.