The MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various mounting styles including front and rear wall mount, jam nut, and box mount receptacles, they offer versatility in installation. With 52 insert arrangements and M39029 rear release crimp contacts, they ensure reliable connectivity. The aluminum shells come in different plating options such as cadmium and nickel, catering to diverse needs. These connectors, meeting military specification MIL-DTL-38999 II, are ideal for applications requiring durability and performance in challenging conditions.