The MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert and offering a wide range of receptacle styles including front and rear wall mount, jam nut, and box mount options. With an operating temperature range of -65 °C to 200 °C, these connectors are environmentally sealed for reliable performance. They come in aluminum shells with various plating options, such as cadmium-free finishes, and utilize M39029 rear release crimp contacts. Ideal for military and aerospace applications, these connectors meet stringent MIL-DTL-38999 II standards, ensuring durability and quality in demanding environments.